Malicious PDF — malware analysis report

Static analysis result for SHA-256 1665715ab3fe326f…

MALICIOUS

PDF

117.7 KB Created: 2021-03-01 01:53:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: cf39b22242996497648b472cdfe52644 SHA-1: f567cdfc6e0fd881cc5ccdf84ba7a5ac25324346 SHA-256: 1665715ab3fe326ff3749e72024d9486f96264fdaa096c5c033ee0f33b25b54e
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically pointing to a link farm on disposable hosting, suggesting a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://vilenefex.ru/123?utm_term=separation+process+principles+3rd+edition+solution+manual PDF link annotation
    • https://mabunamu.weebly.com/uploads/1/3/4/9/134902385/3483517.pdfIn PDF document text
    • http://pemufosapakem.mypressonline.com/why_did_they_get_a_new_cast_for_diary_of_a_wimpy_kid.pdfIn PDF document text
    • https://cdn.sqhk.co/vafodagusun/igjkwii/call_of_duty_warzone_map_locations.pdfIn PDF document text
    • http://vipadobotisituz.mygamesonline.org/how_to_get_better_at_stock_trading.pdfIn PDF document text
    • http://tuligofabuwisa.22web.org/columbia_mailman_course_guide.pdfIn PDF document text
    • http://rivozuzeno.mywebcommunity.org/my_whitfield_pellet_stove_troubleshooting.pdfIn PDF document text
    • https://rakevuxex.weebly.com/uploads/1/3/4/0/134040666/goxutibekemamale.pdfIn PDF document text
    • http://kowabasozawe.iblogger.org/72576654157.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425501/normal_60038c03d0f65.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xemunebo.atwebpages.com/zojanipivejipefarerefa.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_off000186f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186F8 5484 bytes
SHA-256: 02e350ce8004748ea0c8876f2662ebd802efab3884cfa6973d697cb68f5d0bb4
font_01_sfnt_off00019987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19987 15632 bytes
SHA-256: adf2c681cf703483ddf2e468ad3fc047b3ed81b6b4312f6ff43eac1cbfca7328

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