Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8311390c9cfef0b…

MALICIOUS

PDF

74.0 KB Created: 2021-02-28 17:40:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d47d57e447ddde9c0b42ce9d94f2eb9d SHA-1: 3e59973d3f8e6f9afd7b550c3c7f37e954123ac7 SHA-256: b8311390c9cfef0b7f64a0fa8431118225df56dfba007d8922f06db0a1e4c4fa
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, containing numerous external URLs pointing to disposable hosting services, likely to distribute further malicious content or engage in phishing. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://lozipotod.ru/strik?utm_term=ar+15+handguard+removal+without+tool PDF link annotation
    • https://zoluwapipapak.weebly.com/uploads/1/3/5/3/135321816/071ffc3b63a.pdfIn PDF document text
    • http://aycotoro5.xyz/killer_virus_game_android_mobilec1fdj.pdfIn PDF document text
    • https://ximepovefuvaxoj.weebly.com/uploads/1/3/1/8/131856443/xurijo-bezagesexegugus.pdfIn PDF document text
    • https://cdn.sqhk.co/jilebodetifa/gf2Igg8/ice_scream_2_horror_neighborhood_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jiguluzufuwa/VNjjxZP/41323255054.pdfIn PDF document text
    • https://gapidegit.weebly.com/uploads/1/3/1/3/131379699/8890730.pdfIn PDF document text
    • https://sizadomuwegemos.weebly.com/uploads/1/3/5/3/135335556/7632576.pdfIn PDF document text
    • https://nipoxumafoji.weebly.com/uploads/1/3/4/7/134717148/4606737.pdfIn PDF document text
    • https://cdn.sqhk.co/vixemujomu/vEwdLhh/capsule_wardrobe_fall_2020_youtube.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385198/normal_5fe7c9c3030b2.pdfIn PDF document text
    • https://gijamaxo.weebly.com/uploads/1/3/0/7/130740113/2617807.pdfIn PDF document text
    • http://cethq.xyz/toyota_forklift_spare_parts_manualvg29j.pdfIn PDF document text
    • https://pafuxasakilufa.weebly.com/uploads/1/3/5/3/135327400/c96dbe365.pdfIn PDF document text
    • https://pelozaxuji.weebly.com/uploads/1/3/2/6/132680784/libes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F9 5376 bytes
SHA-256: 2c9bab9c73385ce66d96c4e4434280583c4d5f152ed409e586d493538d8c5959
font_01_sfnt_off0000f936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF936 10004 bytes
SHA-256: 87fd37e4ff918613acba3e90730894e0f1c5d692fb7d4092c0ee8c7b6593cecd

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