Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf31df449c36e90…

MALICIOUS

PDF

81.3 KB Created: 2021-03-16 06:31:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 05c3f56d1fcfe2a63260947d07c232bf SHA-1: 5921f3d2d16d56f15b3535aece38d54299c1d3f2 SHA-256: 6cf31df449c36e90d223fe299945ff3f91d4629e8268a81c836a2916158382bf
204 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of an SEO link farm designed to obscure malicious content. One critical heuristic identified a link farm leading to a redirector URL, and another flagged the PDF as malicious based on ML classification. The ClamAV detection further supports the malicious nature. While no scripts were directly extracted, the PDF structure and heuristics indicate a phishing or malware distribution attempt, likely using a link farm to host or redirect to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/123?utm_term=apgli+new+proposal+form PDF link annotation
    • https://s3.amazonaws.com/ruzaganog/30051690085.pdfIn PDF document text
    • http://migriruy.ru/2776995767zr0li.pdfIn PDF document text
    • http://copyright-central-media.com/jilabovijiteratojq3yj.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/how_do_i_change_the_clock_on_my_blue_angels_citizen_eco_drive_watch.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/animated_sad_video_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/46814562566.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/rugipako.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/circle_circumference_worksheet.pdfIn PDF document text
    • http://agent-spv.space/new_mexico_tech_first_responder_training_programu0tor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388406/normal_5ff90b2d2471f.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/gosezoru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378155/normal_5fd1007d5b6d9.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/eversource_report_gas_leak.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/adobe_indesign_cs6_direct.pdfIn 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/d94a54c3-6f5c-4514-bed7-be1f61bad7d4/gesoxitaponulufi.pdfIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_2d364364e30e4fac92e5166998a76e25.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdcd3c9d-8765-4f14-9f65-a5d315750473/what_was_the_daily_life_of_a_native_american.pdfIn PDF document text
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_f08d4f6d773a4679aafb475d2b552e20.pdf?index=trueIn PDF document text
    • https://327bbe42-9aa5-4ca0-80e5-6c9857058a26.filesusr.com/ugd/2b870b_90c6e94bb24a439ab0a5e7091973b4ae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0edfcd77-233d-411b-b028-52ff153d7a82/10807637444.pdfIn PDF document text
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_198853d3455e40d58aca069eb8cf68d9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4cfae50-6c62-4a4e-827b-5a1ba802fa77/accu-chek_aviva_test_strips_discount_card.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ddd6999-50f2-43d4-8bd4-c1c9b8dfc631/metodologia_dela_investigacion_cientifica.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
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA08 5300 bytes
SHA-256: e4dd36ef2d041ea787a51c85676b1aa62cd8dcf57ae65a94f91c931d24172b9e
font_01_sfnt_off0000fc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC13 11228 bytes
SHA-256: 3b0427bc6449df9d9462f0cbe575aa6df0e4abc041c61289668c7f2752121da7
font_02_sfnt_off00012296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12296 16172 bytes
SHA-256: 96e06106e3006553386fba87c243c4a28b622411f61b38071404873282de63a9