Malicious PDF — malware analysis report

Static analysis result for SHA-256 7363f514ff78f9e0…

MALICIOUS

PDF

76.9 KB Created: 2021-04-10 23:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51cd1b492720d23c0400556a89952cfd SHA-1: 73f24ad48a4fab9550dcd33ee7c90370e391baab SHA-256: 7363f514ff78f9e0b86c75bd2a76a886dec426b3a3a1f975b052e1fd1ff39d4a
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, exhibiting characteristics of a phishing or malware distribution campaign. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. The embedded content, though heavily obfuscated, likely serves as a lure to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/strik?utm_term=plot+summary+of+hamlet
    • https://cdn-cms.f-static.net/uploads/4388819/normal_6024173178526.pdf
    • https://zerivomixiloz.weebly.com/uploads/1/3/4/6/134664353/kixata_kivogutujib_lakakuma.pdf
    • https://cdn.sqhk.co/nesadatifu/bgiQYjc/85999995541.pdf
    • https://cdn-cms.f-static.net/uploads/4467945/normal_6015f1fa0f56b.pdf
    • http://bigops.fun/vebagawiner84qn.pdf
    • https://zedimubaxujejit.weebly.com/uploads/1/3/4/7/134715534/kososexeduz.pdf
    • http://gufutaca6.xyz/82981247421y1506.pdf
    • https://cdn.sqhk.co/xinulezebi/jm5ghhh/gwinnett_braves_stadium_seating_chart.pdf
    • https://wowobomufib.weebly.com/uploads/1/3/0/8/130874304/0e5d0.pdf
    • https://cdn.sqhk.co/pevedapev/iiijhgr/91133761901.pdf
    • https://cdn-cms.f-static.net/uploads/4427519/normal_60362414012c2.pdf
    • https://cdn.sqhk.co/wunasesev/Egehegd/20111344005.pdf
    • https://static.s123-cdn-static.com/uploads/4374956/normal_5ff80e2ba0a7d.pdf
    • http://filmera.ru/el_negocio_del_siglo_21z9u7r.pdf
    • https://static.s123-cdn-static.com/uploads/4481065/normal_5ff7d987b3b72.pdf
    • http://beautysss.site/girufodavapogavojozalep1x3e.pdf
    • https://cdn.sqhk.co/gexedamej/eu2RjKE/36156562882.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fe6f2c0a-6367-46ac-a18e-aaab7858c35f/75670029650.pdf
    • https://uploads.strikinglycdn.com/files/e6b8e8fb-b264-4fe8-855a-1a9d2255d79d/how_do_i_use_the_auto_clean_on_my_black_and_decker_iron.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0e8.bin
5c3b248e787b437f57dd5e05cc511ac9ed48209ff7a30da9570e89ac572be8ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E8 5112 bytes
font_01_sfnt_off00010224.bin
fd9f6481759858f2284f2f48a4ed7f43c1f817bdbab95fbc962c496bf8d6e37d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10224 10324 bytes

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