Malicious PDF — malware analysis report

Static analysis result for SHA-256 43d0b351e85449d8…

MALICIOUS

PDF

72.9 KB Created: 2020-11-30 20:00:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 360dc9450c0bcf324ca6668c92d2c32e SHA-1: e2a9b7f4f6aa2cadc728fd06d66f411897a5b386 SHA-256: 43d0b351e85449d83ef9844169bf17598f839d453e6c6a1564d4e808668d1ced
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or SEO spam. The embedded URLs point to various PDF files hosted on disposable domains, suggesting an attempt to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/aws?utm_term=back+to+sleep PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4428061/normal_5fa5e16071915.pdfIn PDF document text
    • https://geredape.weebly.com/uploads/1/3/4/3/134349068/lemulizifi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481059/normal_5fbe8fe3bf0da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369664/normal_5fa52c490539b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404739/normal_5fb7a01516c92.pdfIn PDF document text
    • https://sakafafemowuva.weebly.com/uploads/1/3/4/6/134694971/a0b51f082845.pdfIn PDF document text
    • https://torififaw.weebly.com/uploads/1/3/4/6/134690130/votupod.pdfIn PDF document text
    • https://nowusunomotir.weebly.com/uploads/1/3/4/3/134314498/b27f64.pdfIn PDF document text
    • https://jeretidaker.weebly.com/uploads/1/3/4/5/134595905/335167.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379053/normal_5f9005c5d5d58.pdfIn PDF document text
    • https://wodedofa.weebly.com/uploads/1/3/4/3/134320626/winakonudutisan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374360/normal_5f96698fb08d3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0eb79e5c7695ca99bb922/t/5fc1a2d1fa04221c715d0078/1606525650670/67454794588.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_off0000e396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE396 4944 bytes
SHA-256: 844563298c96123e4936ccf64a4cd95f6b6dafeeca2cc9370b50924092cc3fe7
font_01_sfnt_off0000f482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF482 10192 bytes
SHA-256: a26b95c52b9e99e68e6b97d31b6a996d3ec568956e0fdb280b274a124c6a7fab

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