Malicious PDF — malware analysis report

Static analysis result for SHA-256 7074a2af977777ce…

MALICIOUS

PDF

68.0 KB Created: 2021-01-10 22:43:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b852089b7519e15770468ba97bd583c8 SHA-1: 151c325e0317794d012d0907ab619e89f904be6a SHA-256: 7074a2af977777ce9df7ae1dca4164707054028cb93e72227dfac86d947f1ebc
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file contains a large number of external links pointing to other PDFs hosted on disposable domains, a common tactic for distributing phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs and the PDF structure suggest the primary goal is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffe.ru/123?utm_term=intraregional+migration+in+a+sentence PDF link annotation
    • https://tofudilasikota.weebly.com/uploads/1/3/0/9/130969343/jufuj.pdfIn PDF document text
    • https://gagegopered.weebly.com/uploads/1/3/4/8/134880179/womagagurajutul.pdfIn PDF document text
    • https://vuteduwezo.weebly.com/uploads/1/3/4/3/134336695/136fd2d3.pdfIn PDF document text
    • https://rofikilidoxomuk.weebly.com/uploads/1/3/4/0/134017179/fevetutiwoserax.pdfIn PDF document text
    • https://zodowiburasuv.weebly.com/uploads/1/3/4/4/134448486/3299536.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385413/normal_5ff4f0ac672ef.pdfIn PDF document text
    • https://dofafurubes.weebly.com/uploads/1/3/4/7/134762343/9219445.pdfIn PDF document text
    • https://bakabita.weebly.com/uploads/1/3/5/3/135309819/7563470.pdfIn PDF document text
    • https://gebawifu.weebly.com/uploads/1/3/1/4/131483167/dizereluzo_nazat.pdfIn PDF document text
    • https://jomefibid.weebly.com/uploads/1/3/4/5/134596324/1348070.pdfIn PDF document text
    • https://nevikafujar.weebly.com/uploads/1/3/4/3/134380077/mudovu_kirawanitimol_kupud.pdfIn PDF document text
    • https://cdn.sqhk.co/tubafejog/gJL7iay/naia_soccer_championship_2019.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_off0000cfd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD9 5056 bytes
SHA-256: 17751d5923e399afe4088b9100fa69b4092a28627f77a020292dd9a520f6c0fa
font_01_sfnt_off0000e0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F4 10168 bytes
SHA-256: 5b1791f3c3b79d9509c284748c33527a315341ff01910b2f6012079d39c9faa9

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