Malicious PDF — malware analysis report

Static analysis result for SHA-256 938ef3f16f92434a…

MALICIOUS

PDF

71.7 KB Created: 2021-01-01 06:51:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 977246fa1d29b54772e4544c5e1985b8 SHA-1: b5c790d58a716b7b764825775066cdd1d2c5e5e5 SHA-256: 938ef3f16f92434aae5653eeabcf4c52fdb92e8f74ce67b207b4068f6c529044
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a large number of external links, characteristic of a link farm. The primary URL, https://trafficel.ru/123?utm_term=ee+red+and+cream+dachshund, suggests a lure related to search engine optimization or potentially a phishing attempt. No scripts were extracted, but the PDF structure itself facilitates the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/123?utm_term=ee+red+and+cream+dachshund PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470016/normal_5feb9b701f6e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417656/normal_5fa17b40919ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382793/normal_5fa5e2df364cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401983/normal_5fb2adc1946b6.pdfIn PDF document text
    • https://bibeliki.weebly.com/uploads/1/3/0/7/130738572/3cb0909ff837fef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401983/normal_5fc7d69baf2ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473062/normal_5fb6ee6c59867.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470836/normal_5fc804689a01f.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/bipovoromoj/portfolio_one_page_template.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/67007911134.pdfIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/raxajoxifejidob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f941092-1576-4c36-803d-d0a4b703e3da/zuketerusirix.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/advanced_engineering_mathematics_4th_edition_zill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0963909b-ed39-43bd-ad27-a089851ea43e/bomifufajanexim.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_off0000dc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC56 5104 bytes
SHA-256: 15e538aca3fa20301ada96befca744ba9924edcadc16b6b3a426f7257dd195a4
font_01_sfnt_off0000ed82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED82 10744 bytes
SHA-256: a75e6e334df05b48240d98d5c498a1496ef546c1edc26471844652636bbe74d3

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