Malicious PDF — malware analysis report

Static analysis result for SHA-256 76c0126fbe7edc54…

MALICIOUS

PDF

86.0 KB Created: 2021-02-20 14:49:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: c927eb99151af8a7eb77490438cd1248 SHA-1: e39f2bccc6d00b865e40704be3405a3e3dbc0d08 SHA-256: 76c0126fbe7edc54c1b774c8333dde0ddb281281044f3122a60289314862614b
216 Risk Score

Malware Insights

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

The file is a PDF document that impersonates the brand UPS to lure users into clicking a link. The PDF contains a large number of external links, many of which point to redirectors or other PDF files, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely credential phishing.

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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://bajixaxazuxu.weebly.com/uploads/1/3/1/3/131383864/4878499.pdf.
  • 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://jacksth.ru/strik?utm_term=touch+of+class+coupon+code+november+2019 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4456143/normal_5ffbc97b9af2c.pdfIn PDF document text
    • https://cdn.sqhk.co/jixuvepabu/geicgj4/cramps_translation_in_tamil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404739/normal_5fcc797486d41.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413239/normal_5ff07955be206.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/fk7B1NH/ludo_king_hack_apk_download_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456660/normal_5fe7c9d3dd61d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409255/normal_6016f594dd481.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393908/normal_5fe527e3d4d27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365628/normal_5fd60f7dd6c47.pdfIn PDF document text
    • https://bajixaxazuxu.weebly.com/uploads/1/3/1/3/131383864/4878499.pdfIn PDF document text
    • https://kukitame.weebly.com/uploads/1/3/1/3/131379641/gasogi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413713/normal_5fce2fe89211c.pdfIn PDF document text
    • https://mejebepagomuda.weebly.com/uploads/1/3/4/4/134494428/dakufa-navejikesepok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490370/normal_5fe348ab24794.pdfIn PDF document text
    • https://cdn.sqhk.co/jenetuwuda/ihajaih/best_spades_app_for_android.pdfIn PDF document text
    • http://nimojojisox.22web.org/zojexopaxaz.pdfIn PDF document text
    • https://cdn.sqhk.co/fupokonabat/cXhgMw4/76062641767.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_off00010fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBE 6028 bytes
SHA-256: 54db28e7f4c66b272cd99b4cb049ce134c25b4fcdb982cb45bef45bd4eb53aa3
font_01_sfnt_off0001241c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241C 11428 bytes
SHA-256: a32653a73f765f371140a75c52b827d8557f743f69c78119a18d712871e027e6

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