Malicious PDF — malware analysis report

Static analysis result for SHA-256 f47a4de553e3421a…

MALICIOUS

PDF

78.5 KB Created: 2021-06-03 08:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 669a6e077802d5cfd5dd08aaaa2dc8d5 SHA-1: dd9c0df26068f02aee430ec9541268196ed3aacf SHA-256: f47a4de553e3421ac1f3805795640ecb491ac7b62972e3c6d4acd037cf94410e
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://fokemale.ru/123?utm_term=performance+parts+for+2013+honda+civic+si PDF link annotation
    • https://tujobofawoti.weebly.com/uploads/1/3/2/6/132695409/bulirigizam-jisopel-jevujaxigubize-lutuvomokeviz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367925/normal_600013801caf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410190/normal_5fd155b1bfcda.pdfIn PDF document text
    • https://rupokolox.weebly.com/uploads/1/3/0/8/130813141/gemim_wuzewi_rokafapig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527237/normal_603c748459774.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445115/normal_600facd684fa5.pdfIn PDF document text
    • https://turezizudowan.weebly.com/uploads/1/3/1/6/131606253/42e1252d0c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476567/normal_5fece691b2c41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403959/normal_605cdbde5dbba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403541/normal_60231421dcc4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420030/normal_6022bd9429403.pdfIn PDF document text
    • https://jitaginedisa.weebly.com/uploads/1/3/4/3/134324559/9864218.pdfIn PDF document text
    • https://kisoxorojapaga.weebly.com/uploads/1/3/7/5/137512046/0642b238e0e8ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413118/normal_5ff75f744e9f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409239/normal_601f11f31dac4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373259/normal_606a441b2500d.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4424009/normal_60b617179df52.pdfIn PDF document text
    • https://lipodemofuxe.weebly.com/uploads/1/3/5/3/135316225/1955030.pdfIn PDF document text
    • https://legovizadedugid.weebly.com/uploads/1/3/1/8/131856283/sosidejekorekep_mizifevujigafa_tudax_fuvatufurax.pdfIn PDF document text
    • https://judezasisurag.weebly.com/uploads/1/3/4/4/134498900/05713dac3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485689/normal_60570f5963516.pdfIn PDF document text
    • https://lujomawaki.weebly.com/uploads/1/3/4/5/134577487/gupejom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454575/normal_60226ec09bafd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365594/normal_600257f771746.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_off0000f37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37D 5916 bytes
SHA-256: db0969c531531b4b64bd832f8e37c289d8c9722deba5ccdd497d01fa84078801
font_01_sfnt_off0001077c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077C 10824 bytes
SHA-256: eb92676f4a727bebb986b7c22e63cab26801ef219e8cdaee1b8e48eda9eed697