Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c6c9b3296386dc2…

MALICIOUS

PDF

77.9 KB Created: 2021-03-23 02:02:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a7228b898ef7f92b849b9951922335a3 SHA-1: 40d8448e210cee50fe734b0e88b9862df9146648 SHA-256: 0c6c9b3296386dc29bd41364ad94964d38d2c2657ad2cabd6b9472ba32bd43c5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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.
  • 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://dafemum.ru/wix?keyword=fry%2527s+first+100+words+checklist PDF link annotation
    • https://cdn.sqhk.co/vabedesi/jeij9if/kajekovidawufibidoku.pdfIn PDF document text
    • http://labincom-med.ru/carrier_furnace_thermostat_manual4a0uz.pdfIn PDF document text
    • https://cdn.sqhk.co/felolavap/fLIiiif/super_city_building_game_mod_apk_android_1.pdfIn PDF document text
    • http://ryursew.space/noxabuwcrogw.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/37754f47-d655-40b0-819a-4a8677244137/naming_organic_compounds_practice_problems_with_answers.pdfIn PDF document text
    • http://jemumanapumaze.epizy.com/62375178885.pdfIn PDF document text
    • http://jofifabe.rf.gd/review_on_lights_out_2016_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6fb7bf2-f6a8-47ff-967c-a9cdfa50d109/xijorujegeleferivifudelub.pdfIn PDF document text
    • http://mekufajotifix.rf.gd/bbfc_guidelines_15.pdfIn PDF document text
    • https://85d2c5a2-fc31-4f76-86b4-4ebe2abe2bf4.filesusr.com/ugd/a8cc01_adaa99bcc49f4f35bbcd3209d5f0a3cd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a83e0a70-1c51-462a-9d39-bf3bf7e19605/english_grammar_online_exercises_tenses.pdfIn PDF document text
    • http://bizuwututemi.rf.gd/mesexawinamex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96574776-9911-44a8-a80a-94967abd3416/netgear_prosafe_gs116na_switch_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07522bd5-97cc-4f9a-9850-d1cf15b922fa/ford_501_sickle_mower_parts.pdfIn PDF document text
    • https://a84030a7-2e48-4039-807a-383e2b7216cc.filesusr.com/ugd/c5d40f_c15958145de94286aa1b46b9c6774822.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B8 5340 bytes
SHA-256: a82310ae8d4ebfbdebef4b4cf77357e840c9697bb5da4920a902d45698eff5ee
font_01_sfnt_off0001060e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060E 10772 bytes
SHA-256: 6a1b5e71f3d0009e055912b11ea15e2e70f1e76b5959fed1800bde8047433acd

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