Malicious PDF — malware analysis report

Static analysis result for SHA-256 347957b07d31fecd…

MALICIOUS

PDF

70.1 KB Created: 2021-01-05 03:39:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: e76fa927b20c7feed6b931ef799b9299 SHA-1: 1c9daad99472e473b7abfb8d25d18f2dd9ae151d SHA-256: 347957b07d31fecd33a3d0e611c0b22acfedfe526c22a8a597b05c6700eca16e
214 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to an 'answer key'. The presence of numerous external PDF links, many hosted on S3, indicates a link farm designed to distribute malicious content or engage in SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/123?utm_term=latent+prints+worksheet+answer+key In PDF document text
    • https://wunimebi.weebly.com/uploads/1/3/4/3/134361225/8f383e96d428b.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/jotizifime/66277330834.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/swahili_worship_songs_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e4618e6-3762-4d81-94c0-233b94a4e661/ronovibemeb.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/rotagagofinanotukuxi.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/pokemon_rare_symbols.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/alcohol_and_drugs_abuse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ccac975-4a39-479a-8ddc-c6cd73168098/33219402275.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/logakevow.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_off0000d742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD742 5076 bytes
SHA-256: bc3f258e59a4ccfa8482bd9e986621d8a1fe1930e14727894bc868aa9fd6bf8b
font_01_sfnt_off0000e89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89C 10448 bytes
SHA-256: 354b717a52751ad2496aa2ad223e65946f3bdbd2170a5d251ad23a0b50dbc075

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