Malicious PDF — malware analysis report

Static analysis result for SHA-256 9119c40315caf1fe…

MALICIOUS

PDF

77.1 KB Created: 2021-05-24 13:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: adad89e3bd8438cb20b1084c04a02c79 SHA-1: b0dfac973b1a76665379c96c2c80063b4a65e29c SHA-256: 9119c40315caf1fe22d1fc7a597526437e54419d27238095531431c7ad43ffb8
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains numerous external links, with a primary URL pointing to a suspicious domain, likely intended to redirect users to a malicious site. The document body is heavily obfuscated, but the presence of external links and the 'PDF_SEO_LINK_FARM' heuristic suggest a tactic to distribute malicious content or phish for credentials.

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 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.
  • 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://druttle.ru/strik?utm_term=aa+comes+of+age+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444884/normal_606cb9a7239b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500679/normal_60026eab41cc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469126/normal_6040a5c962e25.pdfIn PDF document text
    • https://fataleripe.weebly.com/uploads/1/3/0/9/130969718/cd6b08888215.pdfIn PDF document text
    • https://tokegomobox.weebly.com/uploads/1/3/4/3/134314144/3693486.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414701/normal_5fcbb460062b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393179/normal_6063b31173626.pdfIn PDF document text
    • https://lolekujawifom.weebly.com/uploads/1/3/1/0/131070351/dc43b9dcc0c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/70599904642.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/free_ukulele_christmas_songs_with_chords.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bc8ed15-79df-4fd9-a417-800a2e9b2dea/golden_song_thailand_season_2.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/what_is_the_best_personal_trainer_certification_in_pakistan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51345fb1-bd5f-4606-b533-c29b057af80c/giluwom.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/41769651970.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efa14752-2a02-49b7-8a86-e89deb2c79a0/91668975411.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d8f6799-bd63-4acf-b07f-9ea5f060a3e4/99296761408.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0274899c-105a-4031-a3fc-b6a69520bcaa/88143274554.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/zexixugotugut.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

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_off0000ef21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF21 5336 bytes
SHA-256: 138922930222162dab261d77bc27e1f314f7eb74f2c9c7df74c48f41236c5b66
font_01_sfnt_off00010142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10142 11304 bytes
SHA-256: 5098b1ae6e29a3d161415b5377e0b1ebf2a703abe768e8ec2ab7e26a965be883

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