Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f3093e67a6f30c1…

MALICIOUS

PDF

74.5 KB Created: 2021-02-13 01:49:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 4d5b0a12194fddb701d6c630bf4fdba2 SHA-1: 15e600822838ccf818a21659e164d80bc642c387 SHA-256: 3f3093e67a6f30c132b2f3cedeb4174f262099faaf5ec0427cbed707efcce65f
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to lead users to potentially harmful content.

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=breadman+pro+tr875+user+manual PDF link annotation
    • https://salabupomisopef.weebly.com/uploads/1/3/4/6/134631393/7695191.pdfIn PDF document text
    • https://gufonalika.weebly.com/uploads/1/3/4/0/134096228/lobinivo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488560/normal_5fe9e1195047a.pdfIn PDF document text
    • https://jirozonuk.weebly.com/uploads/1/3/1/6/131606844/6defdd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481155/normal_5fc79c550226b.pdfIn PDF document text
    • https://xigowepuge.weebly.com/uploads/1/3/6/0/136082497/8710729.pdfIn PDF document text
    • https://fukopimuwevi.weebly.com/uploads/1/3/5/3/135351499/pajadepamelanur_kajiwixebug.pdfIn PDF document text
    • https://tusosalowikos.weebly.com/uploads/1/3/1/4/131453146/42ef4a5.pdfIn PDF document text
    • https://rivoliga.weebly.com/uploads/1/3/5/3/135311175/mijobolago_kuwawokumitaj_xededasilu_piruk.pdfIn PDF document text
    • https://zekenegelu.weebly.com/uploads/1/3/4/3/134390475/2375525.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367952/normal_60134f3c3eab9.pdfIn PDF document text
    • https://nivujetomut.weebly.com/uploads/1/3/4/7/134753784/vubalin-tezabepelis.pdfIn PDF document text
    • https://vukivogo.weebly.com/uploads/1/3/5/3/135329669/1682232.pdfIn PDF document text
    • https://nanuleseja.weebly.com/uploads/1/3/4/0/134012971/8237896.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500440/normal_60206fa4f228e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463286/normal_5fde1fccdb8fa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xerevim.epizy.com/konukatolama.pdfIn PDF document text
    • http://wuwatomugexove.epizy.com/6269586906.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_off0000e61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61A 5552 bytes
SHA-256: 9f83676a82d1c93e3ac458cac8a1bfa87f3b7692d6024afe66226a112197958a
font_01_sfnt_off0000f8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E6 10660 bytes
SHA-256: 519d5b1edb9306db0fbd085f5f5ebb367cf5ee5ebc2f07c0aaf4fe29b04bda7e

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