Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b319050fc72f3f…

MALICIOUS

PDF

61.3 KB Created: 2020-11-11 14:58:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 1eb86b67fae0a2ffbb7fb84233877413 SHA-1: 1c122b73c36bc7ca8ed9338d8b7747bcc72e11c8 SHA-256: 80b319050fc72f3f1d051fdcb18c23d7d5bcefc68261792364bcf3e45f8bb83d
214 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with several pointing to known malicious redirector infrastructure. The heuristic firings indicate a malicious redirector and a PDF link farm, suggesting the primary purpose is to direct users to potentially harmful websites. While no scripts were explicitly extracted, the nature of the embedded links and the ClamAV detection strongly suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/aws?utm_term=anime+fabric+cotton In PDF document text
    • https://cdn-cms.f-static.net/uploads/4416500/normal_5fa3bc24d223e.pdfIn PDF document text
    • https://zirufifun.weebly.com/uploads/1/3/0/8/130874679/a016c237a6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412894/normal_5fa50c5241bab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417983/normal_5f9ac0b35508b.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/wefojeze_kesinaduriza_fivoresem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366952/normal_5f8779f7f3e2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366637/normal_5f89b4b973c93.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kizuporowefib/supply_chain_strategic_fit_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eaeb3f6-1fa7-44a4-a8d4-38cf59fe1923/37148452026.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/kingdom_of_mocha_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1303ebe1-b618-47de-a950-aae79f82a720/88415067721.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac1636b2-6496-48d2-a941-bbee8cac1060/25766300736.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/335e7b57-9e25-4d42-b16c-5449f5d1a9f9/ladivetafupikum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/233edfc2-4567-4d93-b096-e6a97a56aaf6/rival_1.5_quart_ice_cream_maker_instructions.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_off0000b5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5DE 4948 bytes
SHA-256: 7313bcae7afbc7392bb02582164cf604dc6c3aaaa3e517d4ec01dbb07bd61f39
font_01_sfnt_off0000c6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A1 10000 bytes
SHA-256: 55b91650ad5caff49a0e2ff50d453c1bad6e99559caba6b234abc10bc750d564

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