Malicious PDF — malware analysis report

Static analysis result for SHA-256 9889b3ad6a2225a7…

MALICIOUS

PDF

77.7 KB Created: 2021-06-04 08:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ad18e2c3a1f78be322eb53d9462b366b SHA-1: 0bc587e77834162d91348b8a16a4bd2689774765 SHA-256: 9889b3ad6a2225a7dcf4eb57101595eaf2bc7edbef5793c968d299b192a5c4b4
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external PDF links. The primary URL, https://crophysi.ru/123?utm_term=picture+frame+collage+template+for+wall, suggests a lure related to templates, likely to entice users to click through to other malicious or SEO-abusing content. The presence of many external PDF links indicates a distribution mechanism for further malicious content or a method to artificially inflate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://crophysi.ru/123?utm_term=picture+frame+collage+template+for+wall PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403672/normal_5fe123856540a.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4466379/normal_60b26ebe893ef.pdfIn PDF document text
    • https://lamosovi.weebly.com/uploads/1/3/4/6/134600354/718a3cf1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380881/normal_601c60f2b45c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498678/normal_606e6e3d75ed1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391319/normal_604ae63175c95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485689/normal_602779f5bc3d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379722/normal_6064c73894978.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475719/normal_6068a8c1b3a43.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489977/normal_5fdd32422a146.pdfIn PDF document text
    • https://jarupaxalimex.weebly.com/uploads/1/3/5/3/135324443/43200430c1c9e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402717/normal_600e5bae537b1.pdfIn PDF document text
    • https://zudovizu.weebly.com/uploads/1/3/4/3/134338339/gasoboketomus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459035/normal_6044961418061.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417129/normal_5ffb49cd5e7f2.pdfIn PDF document text
    • https://xuvodovujekezoz.weebly.com/uploads/1/3/5/9/135957716/fepevuvizuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443329/normal_60b888749a397.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403938/normal_600e26618f9e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419437/normal_5ff67200110f6.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_off0000f1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E5 5248 bytes
SHA-256: 0829acb2106da0aa74e9bd4be8a58866fe6e141cf929a7da1bb721ad68943f09
font_01_sfnt_off000103c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C5 11156 bytes
SHA-256: bf2f6bccc60c770a46c73362c844b5838c6efb0a47808869dc31a80dcf314203

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