Malicious PDF — malware analysis report

Static analysis result for SHA-256 28de0c758d0599cc…

MALICIOUS

PDF

76.3 KB Created: 2021-03-22 20:04:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a7fe36ed8b6302e479902dd95a6fe073 SHA-1: cf5532948ad3403b4c6a47fb96db2fb53b43218e SHA-256: 28de0c758d0599cc254729ddcde98235c7313900dac2cd4a7e357289bf0ea48f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9992

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://vilenefex.ru/strik?utm_term=computer+systems+engineering+salary+in+south+africa PDF link annotation
    • http://triple-doska6.club/latex_cv_template_phd_studenttyi9c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379851/normal_5fcf200daabda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387408/normal_5fd622c887004.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386089/normal_5fcf2f3f253c5.pdfIn PDF document text
    • https://cdn.sqhk.co/zimuteraf/jhghYid/my_singing_monsters_toys_series_3.pdfIn PDF document text
    • http://hrushch.space/26932081197a7ufu.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/gi8igGv/balloon_tower_defense_hacked_unblocked_games_66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454677/normal_5fd30602d3269.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426822/normal_600fac6a24319.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/hcieogg/flick_goal_stage_2.pdfIn PDF document text
    • http://cheeronthemove.store/46251541108rf3k1.pdfIn PDF document text
    • https://cdn.sqhk.co/zejizoguzut/jcIvDZ6/54189557007.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447250/normal_60130c6659bd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457011/normal_6029417a1d92e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403541/normal_5ff52fb0bf61c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405945/normal_603b932a498ec.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_014ed584604e46239a6284a84c97e42a.pdf?index=trueIn PDF document text
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_f5566c32cb9b4f6bbc7c68ded98ed11a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dde0f9fa-edc2-42b8-be48-d5231093b05e/87519295767.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf4dacb7-899c-44a5-a489-ad1bf988c466/epson_wf_2540_printing_problems.pdfIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_2fdd1fe0948e4d63aad59a321dec42de.pdf?index=trueIn PDF document text
    • https://2cc12256-1025-444a-bacb-901a9f007bda.filesusr.com/ugd/d1fcfc_1243465bcb494ec192538c8bca7e1cd8.pdf?index=trueIn PDF document text
    • https://7a9095e9-4ba3-4ff7-9406-a75d0382ce8a.filesusr.com/ugd/db93e9_0d0de2e67c1540bb85722dbc51ddb971.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F8 5436 bytes
SHA-256: 1c405b758c1120f6ce29071fe64f879ca4f5fd43173f71345d57fa80238b664f
font_01_sfnt_off0000fc51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC51 10952 bytes
SHA-256: 3015862a660ba47546a36dde41a53f395919f05aeac39196a6828d4ec5421461

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