Malicious PDF — malware analysis report

Static analysis result for SHA-256 d280f29d9826a64b…

MALICIOUS

PDF

60.5 KB Created: 2021-01-15 00:43:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 911eb943ec0122b27041985ca45b8fb4 SHA-1: d6d7655c233c42ca364fb86ba327580af0ac9867 SHA-256: d280f29d9826a64b36075083035639cd53d96d3bff06f044bdc36d602ddf7a3c
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to known malicious redirector infrastructure and link farms, indicating a phishing or malware distribution attempt. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' strongly suggest this malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, likely leveraging T1566.001 (Spearphishing Attachment) for delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • 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://traffmen.ru/123?utm_term=intex+saltwater+chlorinator+manual In PDF document text
    • https://fasanubuxa.weebly.com/uploads/1/3/4/7/134733786/7015c.pdfIn PDF document text
    • https://cdn.sqhk.co/dosakupu/6NU2q8g/31553539565.pdfIn PDF document text
    • https://bimuwosexiwo.weebly.com/uploads/1/3/1/1/131164043/1738150.pdfIn PDF document text
    • https://demizuxikeb.weebly.com/uploads/1/3/4/0/134000208/setixidosev-zegepaja-genofaset.pdfIn PDF document text
    • https://mafupixalikufu.weebly.com/uploads/1/3/4/6/134662523/829a5bd374.pdfIn PDF document text
    • https://cdn.sqhk.co/dasekizob/cx4Pjcf/usher_raymond_songs_youtube.pdfIn PDF document text
    • https://site-1178778.mozfiles.com/files/1178778/torn_acl_recovery_time_soccer.pdfIn PDF document text
    • https://nozijuga.weebly.com/uploads/1/3/4/6/134698325/5105b3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000afd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD1 5136 bytes
SHA-256: 8dcfad51fe380ee7441108127cf42adbae744fceb33f6f4583a3653d352775c7
font_01_sfnt_off0000c12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC12E 10204 bytes
SHA-256: 52b16b488ba842c226c4a73164c4a5167b9c1720d155d4b8e8379873acdfa57a

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