Malicious PDF — malware analysis report

Static analysis result for SHA-256 881259bff3f82784…

MALICIOUS

PDF

71.4 KB Created: 2021-02-18 01:50:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 504330cc4bfb97b35591a5ed7d316ebe SHA-1: 66c119bf41503d23fb1b3f3da8e835002d6b3f7e SHA-256: 881259bff3f82784e6453d72f9295b1106002eb232430d9b36f6b19043264bee
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file is identified as malicious by multiple heuristics and an ML classifier, specifically flagged as a phishing/trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the primary heuristic indicates a mass external PDF link farm.

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://druttle.ru/wix?keyword=spinal+cord+coloring+worksheet PDF link annotation
    • https://vomizovuzib.weebly.com/uploads/1/3/1/6/131637161/daxadot-lowatalujaj.pdfIn PDF document text
    • http://appletopshop.ru/csgo_commands_for_1v19n941.pdfIn PDF document text
    • http://sushibara.net/color_quest_animalsop838.pdfIn PDF document text
    • https://larezonisu.weebly.com/uploads/1/3/0/7/130738889/3f501bc1.pdfIn PDF document text
    • http://lg-copyrightforms.com/kiki_camarena_actorba675.pdfIn PDF document text
    • https://cdn.sqhk.co/derebeduno/iiOgiih/fraser_reekie_draughtsmanship.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/jcjhJLm/3750528394.pdfIn PDF document text
    • http://egosikenclub.com/mystic_messenger_email_answers_lololbq9ue.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369786/normal_5fdfa6c7b48ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462379/normal_602b872398b4e.pdfIn PDF document text
    • https://cdn.sqhk.co/wefadegese/hjhdhik/drag_racing_streets_cheats_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/suxepemup/eiiysPn/vetenixisexo.pdfIn PDF document text
    • https://cdn.sqhk.co/jinuzekovodi/gdgh1hb/97368607885.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481831/normal_5fe2712218e42.pdfIn PDF document text
    • https://wilasumoleliwu.weebly.com/uploads/1/3/1/4/131414134/3173625.pdfIn PDF document text
    • https://cdn.sqhk.co/tupuxinekowa/hpznijX/zudoreliguwavizof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gawekavadave.epizy.com/azure_blob_json.pdfIn PDF document text
    • http://wufutogaj.epizy.com/48769032525.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AA 5592 bytes
SHA-256: 4a72033ca4028b0252121465a6e3763d1c777df3f568ecc8224f8f71343c3b71
font_01_sfnt_off0000ebbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBC 10636 bytes
SHA-256: d3fac6d89f1e3a474f75dee44c2a050fc23dc76198760fd20815e5e09f3cbcbc

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