Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f71c1b396c4f3ca…

MALICIOUS

PDF

66.8 KB Created: 2020-12-23 00:19:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 31b400bdd25ca9d647e83ad6896af7c3 SHA-1: 5f27a8b1e654bba2c8e80e99bfed8c6899801aa9 SHA-256: 6f71c1b396c4f3ca453c7244b6e1df8e2c191357802e468cdd3ae1941428e047
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, including a link farm, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate a focus on external redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://traffset.ru/strik?utm_term=bloomsbury+farm+nashville PDF link annotation
    • https://kenufipafalenar.weebly.com/uploads/1/3/4/6/134616414/ef664.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412151/normal_5fc06e65b96da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378386/normal_5fafbf0763b92.pdfIn PDF document text
    • https://kofudavobew.weebly.com/uploads/1/3/4/6/134602163/8793281.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474979/normal_5fae25e2722a2.pdfIn PDF document text
    • https://wisamifogafize.weebly.com/uploads/1/3/4/5/134598642/7203059.pdfIn PDF document text
    • https://bekijarodik.weebly.com/uploads/1/3/4/6/134617997/7237958.pdfIn PDF document text
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/zipurawosit.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/zabejuvijolu/mobedoxikiba.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/aarti_sangrah_lyrics_in_marathi.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/tekabepulegajuvusumomupez.pdfIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/91872042954.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/94408758953.pdfIn PDF document text
    • https://s3.amazonaws.com/dofufiri/72274100126.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_off0000c9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B1 5360 bytes
SHA-256: eda410cc6202074ae314423c51fff760691037a0d2a665d7dbf8bb9ad91541c7
font_01_sfnt_off0000dbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCC 10236 bytes
SHA-256: 5bff7a8f71fd96c7758c99b51cf739481351701e4957545f11afc34089988c89

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