Malicious PDF — malware analysis report

Static analysis result for SHA-256 fce1f375093eaae4…

MALICIOUS

PDF

83.1 KB Created: 2021-03-31 10:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9586fffdb99da8447187776211bba1f5 SHA-1: 12ad0fcfd5e30c77a360021776813a54aee3c3cb SHA-256: fce1f375093eaae47b0795da47f8bda31d13f70ea53fac74ad318032d102d1e9
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with a primary redirector URL pointing to 'https://jacksth.ru/wix?keyword=quantum+number+worksheet+pdf', suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK heuristics further supports this, indicating the document is part of an SEO-based link farm designed to redirect users to malicious sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jacksth.ru/wix?keyword=quantum+number+worksheet+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407810/normal_5fe74d385beb3.pdfIn PDF document text
    • https://wixugowodekawa.weebly.com/uploads/1/3/1/4/131438135/mulibatedup_lidove_novuwekoburipi_lafejunilozunap.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/84240553192.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/90120444137.pdfIn PDF document text
    • https://totaguzoxexidi.weebly.com/uploads/1/3/2/7/132741029/739a32b35.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/vowovoruvofalataletiwi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465919/normal_601920f3f39a6.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/18945611794.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/orlando_naval_recruit_training_center.pdfIn PDF document text
    • https://s3.amazonaws.com/kasuwevovog/nusa_lembongan_surf_report.pdfIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/ambari_kannada_picture.pdfIn PDF document text
    • https://xipuruvu.weebly.com/uploads/1/3/4/6/134654852/merexexeg-defiro-zilul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464534/normal_5ff43ad0d2ae4.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/brothers_day_movie_songs_maango.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/ulna_bone_anatomy.pdfIn PDF document text
    • https://fodigedij.weebly.com/uploads/1/3/2/7/132740281/99798.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/left_centre_right_wild_dice_game.pdfIn PDF document text
    • https://radifepibonavu.weebly.com/uploads/1/3/2/7/132712096/1890337.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/88e9f46c-caf6-4c52-9a45-c958c595e4a6/chick_fil_a_nutrition_honey_roasted_bbq_sauce.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/baaca563-3b11-4c9d-852d-f517fa25e7ab/what_is_unearthed_arcana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3de2d4ce-5190-4075-a5e2-184ce8030a0f/carrier_58sta_stx_blower_motor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edb72860-14d5-4e5f-8978-f953d323c641/81815096167.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58F 6632 bytes
SHA-256: d276c78442d641b7414186175bb66567a342edeaec5440cf95b3076831e5a609
font_01_sfnt_off0000e60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60C 1964 bytes
SHA-256: cafc66053d53eb8e3277a25bdee2e7701b17d43b20e552da9cba7d884a1a5f39
font_02_sfnt_off0000ef5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5A 5604 bytes
SHA-256: 719480c768daff35787353106f8e5378724023691790bc08f22b4abfcd4fecab
font_03_sfnt_off0001024a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024A 11292 bytes
SHA-256: 9a58e8d18e88bf5383ca00d5ae117738b0bf8f81e191046b600572e15a18d048
font_04_sfnt_off000128f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F6 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330

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