Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a2fbe15636a2d2…

MALICIOUS

PDF

63.0 KB Created: 2020-11-14 04:15:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 614d5ac9d2b9a21bd4d641c4cd3ebcc7 SHA-1: 5435eeec19ff6f840536cebf3ec7c7ee22e4bd43 SHA-256: c1a2fbe15636a2d2570670f002760b25a34946c033a134d5bc5ca40864bf2fd5
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm. The primary URL, 'https://traffking.ru/aws?utm_term=chapter+16+vocabulary+practice+economics+crossword+answers', suggests a potential SEO manipulation or phishing lure. While no scripts were explicitly extracted, the PDF structure and the heuristic firings strongly indicate malicious intent, likely to redirect users to malicious sites or to distribute further malware. The ClamAV detection and ML classifier further support this assessment.

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://traffking.ru/aws?utm_term=chapter+16+vocabulary+practice+economics+crossword+answers PDF link annotation
    • https://xijonezamo.weebly.com/uploads/1/3/1/4/131407630/gowena.pdfIn PDF document text
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/lorubavevotu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365582/normal_5f8cab4c21a07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369499/normal_5f963c1fc2a25.pdfIn PDF document text
    • https://bepopasexib.weebly.com/uploads/1/3/4/3/134356469/jorefijinu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378606/normal_5f9c1e87f4216.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/bulozor/miwowanevukatutusux.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/lumajotekopube.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/19692840630.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/4151783244.pdfIn PDF document text
    • https://s3.amazonaws.com/rotafasaniz/gexulikakex.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_off0000b8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A8 5820 bytes
SHA-256: 12a90117fa974afc4fc40485ad25e27206881bb758959391d508f3c0fcb34294
font_01_sfnt_off0000cc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC64 10220 bytes
SHA-256: 910b6b8bc32e377ea768e002b10acfeab319f3617a62eaea24e2b190157705b7

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