Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b2e4507552c4ffd…

MALICIOUS

PDF

131.0 KB Created: 2021-04-24 05:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 0c28c2ab5b03514279a9e03e354d6786 SHA-1: 0a91b87fa884841ffcc509ebaae72c5200fcb0a5 SHA-256: 3b2e4507552c4ffd2712006e23cf1a8faae47eb332d1b2760c7f4a889b7f31ab
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://seumenha.ru/strik?utm_term=fenomenologia+del+espiritu+pdf+fce PDF link annotation
    • https://cdn.sqhk.co/tagodepa/mjdgifQ/merchant_marine_salary_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/xawowaguka/YgfuZPm/pinout_arduino_nano_pwm.pdfIn PDF document text
    • https://zejotagidegixop.weebly.com/uploads/1/3/4/5/134522105/825054.pdfIn PDF document text
    • http://gebikatafexanu.22web.org/xawutezum.pdfIn PDF document text
    • http://vavesojijakoju.iblogger.org/format_code_in_sublime_text_3.pdfIn PDF document text
    • http://majijeniwadimu.22web.org/32605317703.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/4UhcieW/neighbors_place_restaurant.pdfIn PDF document text
    • https://cdn.sqhk.co/dagosasojo/ibKjehi/43835075887.pdfIn PDF document text
    • https://feboratopaw.weebly.com/uploads/1/3/1/3/131383734/2569920.pdfIn PDF document text
    • https://dejamemetegabov.weebly.com/uploads/1/3/1/8/131856029/guzomururorafadoweg.pdfIn PDF document text
    • https://cdn.sqhk.co/tazifawixax/LyVhbYR/79198028672.pdfIn PDF document text
    • https://cdn.sqhk.co/kasuvapexal/gehchg2/no_crop_pic_for_instagram_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/bujerinalo/bugjifC/darkness_and_flame_walkthrough_part_11.pdfIn PDF document text
    • https://cdn.sqhk.co/lutuganoda/jiizUgC/bunch_brothers_auction_fulton_ky.pdfIn PDF document text
    • https://guxodobozit.weebly.com/uploads/1/3/4/3/134333536/gilituwegok.pdfIn PDF document text
    • http://popuboloza.22web.org/71443276590.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xatenekoroxaju.epizy.com/suxufevukopujuxu.pdfIn PDF document text
    • http://riwugiboturom.epizy.com/12121661774.pdfIn PDF document text
    • http://tozuduno.epizy.com/oh_cecilia_breaking_my_heart_song.pdfIn PDF document text
    • http://bilunijo.epizy.com/xusogesusakuperizinonilew.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A09B 5432 bytes
SHA-256: 6f9e43352f12b88b46c65cd8d6a3bc4d37dcaed0819a12324ebd1bee1bbeee62
font_01_sfnt_off0001b2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2FE 16556 bytes
SHA-256: 8ea4fde21bedb9be565f0374b2b18f5438588cde4659404021f8ecd00d6ccf04
font_02_sfnt_off0001e5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E5CF 16504 bytes
SHA-256: 697ac2e4c44059cfacbde895cd7dcf686b922cb7e275b3fa13d652bbef3a337d

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