Malicious PDF — malware analysis report

Static analysis result for SHA-256 68cb23a34fcfde33…

MALICIOUS

PDF

88.6 KB Created: 2021-02-15 03:06:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 93108ad6fef0625f4c0130d7776ff197 SHA-1: 78cdd53b4aa95808b1773e955d7fb873a24605ab SHA-256: 68cb23a34fcfde33af450d5c94384214837a8fc9ced8702fa385908cd82c32d2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm strategy, and the ML classifier strongly suggests malicious intent. The document body, though heavily obfuscated, contains keywords related to TV guides, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/wb?keyword=abc%20australia%20tv%20guide%20indonesia PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403533/normal_5ff5bfa93d0c7.pdfIn PDF document text
    • https://cdn.sqhk.co/dewavasese/nqA0Pgh/knight_fight_medieval_arena_mod_apk_revdl.pdfIn PDF document text
    • http://salestore.pro/warcraft_adventures_lord_of_the_clanse9ry8.pdfIn PDF document text
    • https://cdn.sqhk.co/sisalubitot/JpggKgg/belidelasoselaf.pdfIn PDF document text
    • http://steblin.pro/poxegodinawjqx84.pdfIn PDF document text
    • http://blubadgehelp.net/62042292503xm85a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481056/normal_5ff0ac2c9446f.pdfIn PDF document text
    • http://hookup153.site/87938444454n18uc.pdfIn PDF document text
    • http://byt-upak.ru/jasmine_plant_growing_guidenci1v.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/zexozavo/royal_canin_boxer_puppy_feeding_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/85905392064.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/56270211522.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_off00011bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCF 5296 bytes
SHA-256: 01bcfa10e295bf65f89d9bc3e254e61c97399a808493d086febe0093078320a1
font_01_sfnt_off00012de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE8 13076 bytes
SHA-256: ce590d0eaf41c2bf8e3913cedf8c4b5ffced22d79f1806e6bee54ec0074a7870

Open this report in the interactive analyzer, or submit your own file for analysis.