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)
MD5: 9586fffdb99da8447187776211bba1f5 SHA-1: 12ad0fcfd5e30c77a360021776813a54aee3c3cb SHA-256: fce1f375093eaae47b0795da47f8bda31d13f70ea53fac74ad318032d102d1e9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains a large number of external links, many of which appear to be part of an SEO link farm, and one prominent link directs to a URL that mimics a search result for educational material. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
    • https://cdn-cms.f-static.net/uploads/4407810/normal_5fe74d385beb3.pdf
    • https://wixugowodekawa.weebly.com/uploads/1/3/1/4/131438135/mulibatedup_lidove_novuwekoburipi_lafejunilozunap.pdf
    • https://totaguzoxexidi.weebly.com/uploads/1/3/2/7/132741029/739a32b35.pdf
    • https://cdn-cms.f-static.net/uploads/4465919/normal_601920f3f39a6.pdf
    • https://xipuruvu.weebly.com/uploads/1/3/4/6/134654852/merexexeg-defiro-zilul.pdf
    • https://static.s123-cdn-static.com/uploads/4464534/normal_5ff43ad0d2ae4.pdf
    • https://fodigedij.weebly.com/uploads/1/3/2/7/132740281/99798.pdf
    • https://radifepibonavu.weebly.com/uploads/1/3/2/7/132712096/1890337.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/88e9f46c-caf6-4c52-9a45-c958c595e4a6/chick_fil_a_nutrition_honey_roasted_bbq_sauce.pdf
    • https://uploads.strikinglycdn.com/files/baaca563-3b11-4c9d-852d-f517fa25e7ab/what_is_unearthed_arcana.pdf
    • https://s3.amazonaws.com/zafaronivaj/84240553192.pdf
    • https://s3.amazonaws.com/xidulumexi/90120444137.pdf
    • https://s3.amazonaws.com/babuxufarizuxur/vowovoruvofalataletiwi.pdf
    • https://s3.amazonaws.com/bivanud/18945611794.pdf
    • https://uploads.strikinglycdn.com/files/3de2d4ce-5190-4075-a5e2-184ce8030a0f/carrier_58sta_stx_blower_motor.pdf
    • https://s3.amazonaws.com/livivuvuwugeb/orlando_naval_recruit_training_center.pdf
    • https://s3.amazonaws.com/kasuwevovog/nusa_lembongan_surf_report.pdf
    • https://s3.amazonaws.com/redegelesibif/ambari_kannada_picture.pdf
    • https://uploads.strikinglycdn.com/files/edb72860-14d5-4e5f-8978-f953d323c641/81815096167.pdf
    • https://s3.amazonaws.com/biwubeleba/brothers_day_movie_songs_maango.pdf
    • https://s3.amazonaws.com/bakoloj/ulna_bone_anatomy.pdf
    • https://s3.amazonaws.com/pevarijidasalop/left_centre_right_wild_dice_game.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

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

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