Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a761b8cce009123…

MALICIOUS

PDF

69.6 KB Created: 2020-11-24 06:15:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66f6a3d1920a01a159c05687cf6fe872 SHA-1: 135e9cb2d60c098bc11c7ceec04cb953f37145dd SHA-256: 0a761b8cce00912337d5e074ca1d9e49d615929d9fc57414a498e62898da2d9c
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a large number of external PDF links, suggesting a link farm for phishing or malware distribution. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure itself contains embedded URLs that point to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cctraff.ru/aws?utm_term=clean+architecture+android+l%25C3%25A0+g%25C3%25AC
    • https://niboxevukok.weebly.com/uploads/1/3/4/6/134649508/pidububisojak-wubujimuxo.pdf
    • https://dokakida.weebly.com/uploads/1/3/1/3/131380589/lepebusigajim_parij_kenidez_mosaji.pdf
    • https://cdn-cms.f-static.net/uploads/4380701/normal_5fb27e50cb29d.pdf
    • https://cdn-cms.f-static.net/uploads/4388067/normal_5f8e412e92b71.pdf
    • https://lixabexuraluna.weebly.com/uploads/1/3/4/2/134234562/265219.pdf
    • https://cdn-cms.f-static.net/uploads/4366622/normal_5f872b4156026.pdf
    • https://cdn-cms.f-static.net/uploads/4451047/normal_5fa01c7badf9a.pdf
    • https://vewawuwidavejo.weebly.com/uploads/1/3/4/4/134403009/jitobepil_sitezudugimoz_viwetijivet.pdf
    • https://titawijuneve.weebly.com/uploads/1/3/4/0/134012454/7492fcfed.pdf
    • https://cdn-cms.f-static.net/uploads/4369772/normal_5f90084b7e035.pdf
    • https://cdn-cms.f-static.net/uploads/4475571/normal_5fa7ecaddfc4a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1b97241e-6398-46b4-ada5-7b6ac1452875/75360555372.pdf
    • https://uploads.strikinglycdn.com/files/eba4208f-a4ea-47e3-ab02-3e5598d24736/kovovewerefepa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d190.bin
ac151b90fcf013be52545f6fe8c62bb8249a076ec043c4f80e3e22228b025f0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD190 5216 bytes
font_01_sfnt_off0000e2ae.bin
85cf8d4742018e54d176e0b3c4a6c3ea07ee9749c8affd5300f7100d44e033c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AE 11152 bytes

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