Malicious PDF — malware analysis report

Static analysis result for SHA-256 19f92585b69afa75…

MALICIOUS

PDF

74.4 KB Created: 2021-02-16 06:55:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: a8f65959846da27466cf94a2c35892cd SHA-1: eec61260013e8c871e434fe2297ba8bffc4f676b SHA-256: 19f92585b69afa75e661025d1bd8c3a9af2862086569ac6cfc5b45c3d643f39e
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document contains numerous embedded URLs, many pointing to disposable hosting or domains associated with link farms, suggesting an attempt to redirect users to malicious sites. The presence of 'utm_term' parameters in some URLs further indicates tracking or redirection for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=the+monkees+porpoise+song+theme+from+head+lyrics PDF link annotation
    • https://cdn.sqhk.co/gudijupimeb/jhckgde/70158598305.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503309/normal_5fdffbfdca7cb.pdfIn PDF document text
    • http://springtea.space/51344182199obahf.pdfIn PDF document text
    • https://cdn.sqhk.co/pumopivosoba/PyhehGb/horror_city_zombie_smashers.pdfIn PDF document text
    • https://cdn.sqhk.co/veludewozen/5tZAgjg/sejativepagajodil.pdfIn PDF document text
    • http://popularchoice.space/zoology_lab_manual_hsslive7thnf.pdfIn PDF document text
    • https://cdn.sqhk.co/xatuxazaz/idkjfzN/ruweves.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407304/normal_601dc0b64d575.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462035/normal_6008a5553bc6a.pdfIn PDF document text
    • http://tacfitproducts.com/phonetic_alphabet_font_freedcxpq.pdfIn PDF document text
    • http://chambrely.xyz/59357447409gxcuz.pdfIn PDF document text
    • https://cdn.sqhk.co/petebeki/T1sYVgj/bubble_waffle_cafe_metrotown_menu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451753/normal_5fd89263f40f5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fopekexu.epizy.com/34548189868.pdfIn PDF document text
    • http://mudozegiviw.epizy.com/78913752438.pdfIn PDF document text
    • http://pixoriwabivonol.rf.gd/cruel_intentions_movie_parents_guide.pdfIn PDF document text
    • http://bitegovaduxigag.epizy.com/51144405109.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_off0000e2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C4 5684 bytes
SHA-256: 0369374fb210fc492f2aba48503f31f880bc9207ffed0c247c08c8c929df635a
font_01_sfnt_off0000f5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F9 11188 bytes
SHA-256: f1e461c6862ca0a23fb410c751e07d39fdf638b4fe482c569f6517a9efbcb9cd

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