Malicious PDF — malware analysis report

Static analysis result for SHA-256 dde4a3dfd4ab2936…

MALICIOUS

PDF

77.9 KB Created: 2020-12-30 00:02:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d3c92b44cbdf03e2aea440e929a4354f SHA-1: bd4bd90aef31a012eb8bd114c1386ab8d262de1f SHA-256: dde4a3dfd4ab2936d61f22295b018bb9702b054ceb971710c4c7c036150c14a4
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The presence of a large number of external links, identified as a 'PDF_SEO_LINK_FARM', suggests a tactic to manipulate search results or redirect users. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs point towards a phishing or SEO-based malicious campaign.

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://trafffi.ru/strik?utm_term=vintage+motorcycle+speedometer+drive PDF link annotation
    • https://turetajonu.weebly.com/uploads/1/3/4/6/134629909/2733387.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366987/normal_5f984b3036d5d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365601/normal_5fcaf7d134cef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411220/normal_5fe2ed8dd9219.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381756/normal_5fde0a56ce949.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410194/normal_5fcc8fb77ae3f.pdfIn PDF document text
    • https://kogejuxo.weebly.com/uploads/1/3/1/6/131606118/wuraxinobebof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c68e08e9-5401-492b-bb49-1187a1385b4b/baloxosogigewusunak.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/65143339156.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/tudovubipe.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/xafetodew.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/gudetama_tamagotchi_english_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/muditomulebibididamasibet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eacdbbb3-3113-4ee0-9614-af28a6a1b602/med_surg_nursing_review_course.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/child_and_adolescent_development_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/blocs_wave_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eac600fa-d022-4e50-b183-dc1d83c9ede4/virus_hunters_show.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_off0000f1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BC 5520 bytes
SHA-256: c1cc0058d05c7d24abcf41f15f89f7549a589437f37c53f26be4cc82116748a0
font_01_sfnt_off00010480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10480 11320 bytes
SHA-256: 34d310989731959c415ecbd88e80f567399c6fae7968974ad58d3387d666ab3b

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