Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c7e4ed46240c268…

MALICIOUS

PDF

75.9 KB Created: 2021-02-16 22:16:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 3ba48f25644e07f4172eb393169ffcfc SHA-1: b3202b60758d4e41efb7ec58311f8b95d61ec53e SHA-256: 8c7e4ed46240c268e6d4f5d80e3e56cb13adcda51e90c0a5ea37570e6eb51e30
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier and contains a large number of external links, indicating a link farm or redirection scheme. The document body is heavily obfuscated and unreadable, but the presence of numerous external URLs suggests an attempt to direct users to potentially harmful content or phishing sites. No scripts were extracted, but the PDF structure itself is being used to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://maypoin.ru/strik?utm_term=memento+mori+poema PDF link annotation
    • http://best-store.club/8878700091d5jsp.pdfIn PDF document text
    • http://tokio-2020.fun/you_raise_me_up_violin_sheeterw9f.pdfIn PDF document text
    • https://fozonened.weebly.com/uploads/1/3/5/3/135326763/3a59b8fab58.pdfIn PDF document text
    • https://movojedafep.weebly.com/uploads/1/3/0/8/130814843/tetovej-lajugemajufam-wipodedazobazo-mekorot.pdfIn PDF document text
    • https://gazodajatara.weebly.com/uploads/1/3/2/7/132712558/lipixigezi_febedovo_lokowojamulo.pdfIn PDF document text
    • https://nolipugi.weebly.com/uploads/1/3/4/6/134652161/jutiwav-zisowokasex.pdfIn PDF document text
    • https://jaradaka.weebly.com/uploads/1/3/0/8/130813635/3154638.pdfIn PDF document text
    • https://sisekiki.weebly.com/uploads/1/3/4/6/134622657/5118038.pdfIn PDF document text
    • https://redejejilitut.weebly.com/uploads/1/3/5/3/135305696/wiwukukaf.pdfIn PDF document text
    • https://lurexiji.weebly.com/uploads/1/3/4/5/134594132/7205856804f5.pdfIn PDF document text
    • https://fezewozigu.weebly.com/uploads/1/3/4/3/134318815/pibonupuwa_xokukasuzure_wizafatekaxe_mijuvaxom.pdfIn PDF document text
    • http://richmaya.site/pekekokebom4tqrf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pefogitoveni.epizy.com/32281409829.pdfIn PDF document text
    • http://kixixiwibatogit.epizy.com/chippewa_falls_wi_police_reports.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_off0000eec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC5 4760 bytes
SHA-256: 953ff72671c76e85cda109b0882d5c768b0f9789222dcd0db38255554587d3dc
font_01_sfnt_off0000fee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE5 11092 bytes
SHA-256: a83792faf6cc70ed308d41329667a71b78ada1ee72f0ef4111d1bcd6e0d3bfd5

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