Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bec3a7405716937…

MALICIOUS

PDF

78.3 KB Created: 2021-02-16 22:31:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7401eb079e4a02cd0b363eee31063f38 SHA-1: 84405b86ba164faf01d623884ae7645736683bec SHA-256: 8bec3a74057169375ba87b50aff7f95cb2e758684ef7b636f7c681f171e810f2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/wix?keyword=ap+psychology+chapter+1+study+guide+answers PDF link annotation
    • http://goossyy.online/texas_fire_report_maptrlg8.pdfIn PDF document text
    • http://albl.ru/daisy_powerline_880_owners_manualerq0v.pdfIn PDF document text
    • http://freud.icu/43245234556utomj.pdfIn PDF document text
    • http://vamoktin.ru/95068654465hguzt.pdfIn PDF document text
    • https://cdn.sqhk.co/toruwapelot/QjhvTic/zujuwer.pdfIn PDF document text
    • https://cdn.sqhk.co/robimovule/hjbMajg/wire_size_calculator_dc_current.pdfIn PDF document text
    • http://yourlivehelp.com/the_bucket_list_star_castjwm5r.pdfIn PDF document text
    • http://xelipev.22web.org/1179738657.pdfIn PDF document text
    • https://cdn.sqhk.co/birenejar/orARicw/dadadozokelaxebilewe.pdfIn PDF document text
    • https://cdn.sqhk.co/bavimimo/jhhUpgf/zesasejaped.pdfIn PDF document text
    • http://hookup153.space/138927922374ozx5.pdfIn PDF document text
    • https://cdn.sqhk.co/zipirevofu/bhahagd/guide_for_aquapark_io_game_unblocked.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xefavab.rf.gd/rekorigikugesolezabom.pdfIn PDF document text
    • http://muwided.rf.gd/93238369908.pdfIn PDF document text
    • http://jipokogave.epizy.com/kell_blood_group_system.pdfIn PDF document text
    • http://rozopujonabesix.epizy.com/69423939790.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDF 5572 bytes
SHA-256: 2b271d9ffe724396de64ee115c91431971b6b9dcb121079bbd79e10363d3d1eb
font_01_sfnt_off0000eee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE5 7624 bytes
SHA-256: 2491494aea8eb4aa7f50f4d6c3af0a001ec375c65515f993ef0e9f00ab0cf8fe
font_02_sfnt_off0001089c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089C 10088 bytes
SHA-256: a69221a6748bdfd5f8ba564bae9f5cc72c27067f611f31fce08e692c71a81c8e

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