Malicious PDF — malware analysis report

Static analysis result for SHA-256 227d66a31aca5376…

MALICIOUS

PDF

74.4 KB Created: 2021-02-28 04:26:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 07ef8f7c566219dffde9e8fc7deab7f7 SHA-1: 5baba8de4d4c837967911e1e74026791921fc370 SHA-256: 227d66a31aca5376d6d23ad84d232c59c83f55f856b5797074dbc394a2b4f715
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://golowaki.ru/123?utm_term=parts+of+speech+test+with+answers+pdf', is likely part of this scheme. No scripts were extracted, but the PDF structure itself is used to host these links.

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://golowaki.ru/123?utm_term=parts+of+speech+test+with+answers+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412408/normal_6033b63f968f7.pdfIn PDF document text
    • https://tajixuxax.weebly.com/uploads/1/3/4/7/134751877/dofasuke_tunomigujafix_patusamibi.pdfIn PDF document text
    • https://vibusipapomokij.weebly.com/uploads/1/3/2/6/132682711/df58a1bee.pdfIn PDF document text
    • https://vexepediv.weebly.com/uploads/1/3/4/6/134668456/0e865097f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393370/normal_5feb44e4b6a64.pdfIn PDF document text
    • https://jugujepatuw.weebly.com/uploads/1/3/4/9/134900825/vekeputufimub-wuvox-sumorivebijifa-tezotiburuvive.pdfIn PDF document text
    • https://viliwefat.weebly.com/uploads/1/3/1/0/131069961/gobijekipitixox.pdfIn PDF document text
    • https://cdn.sqhk.co/ketixudolu/gfjgieF/gofabalome.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495262/normal_5fe2abd4653d8.pdfIn PDF document text
    • https://wukarogokemek.weebly.com/uploads/1/3/0/7/130739107/reditemofo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369328/normal_602de44b8a4c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389361/normal_5ffe5a334cc57.pdfIn PDF document text
    • https://cdn.sqhk.co/jabuvilir/1AHihif/dotatumusabona.pdfIn PDF document text
    • https://cdn.sqhk.co/tubadaluzafu/bhcpkZP/dotumojemetaga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410679/normal_60322ceeb503d.pdfIn PDF document text
    • https://cdn.sqhk.co/wujukipako/hdWggCT/17113239090.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD619 5092 bytes
SHA-256: 53b136b82ccc91be67b62f9bbb9cbc2d7ac2a8f015fe654aec8cd92b4ed23637
font_01_sfnt_off0000e76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76D 11564 bytes
SHA-256: 40fbf420ae8c3b7317834ad0e0b4c6d470eb2a3619f16977e11b932ca44c8dbe
font_02_sfnt_off00010e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E78 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

Open this report in the interactive analyzer, or submit your own file for analysis.