Malicious PDF — malware analysis report

Static analysis result for SHA-256 458773fc3e8a824e…

MALICIOUS

PDF

74.0 KB Created: 2021-03-30 15:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 60222331393a4a6894965a6964ed281c SHA-1: 2e39cf4188674f23f840bebe2b3c147ffd366345 SHA-256: 458773fc3e8a824e0709af7b71b67e36da9df3e81ca4c41b5462713ae405e045
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains references to product names and links, reinforcing the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://zajinet.ru/strik?utm_term=citizen+men%2527s+eco-drive+navihawk+atomic+timekeeping+watch+jy8035-04e PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409796/normal_6024293be202c.pdfIn PDF document text
    • http://erkutungotu.com/sears_18_42cc_chainsaw_manual8af5g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420230/normal_5fd11afdd2d20.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://regsenatvumen.website/42922118045ixlbm.pdfIn PDF document text
    • http://onlinetiser.website/why_should_we_hire_you_information_technologyq1u93.pdfIn PDF document text
    • http://gonzo-3d.com/how_to_take_apart_a_zebco_33_reel9mwe3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372100/normal_605aaa155d445.pdfIn PDF document text
    • http://fallofelin.online/tolubuzov43rb9.pdfIn PDF document text
    • http://tolejif.22web.org/baby_einstein_sea_dreams_soother_musical_crib_toy.pdfIn PDF document text
    • http://motirepefasake.iblogger.org/kundalini_yoga_in_bengali.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368479/normal_6039ef866bdf5.pdfIn PDF document text
    • https://memibiwogiluged.weebly.com/uploads/1/3/4/1/134131866/tilibar.pdfIn PDF document text
    • http://copyrightmediahelp.com/bekukaxopujezusamuleravvuhkp.pdfIn PDF document text
    • https://limofagis.weebly.com/uploads/1/3/4/6/134640762/bisikalu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://funadorexizuju.rf.gd/7804601515.pdfIn PDF document text
    • http://dizavinizekabos.rf.gd/rig_veda_in_sanskrit_with_bengali_translation.pdfIn PDF document text
    • http://gepaboveron.epizy.com/report_writing_on_flood_situation_in_mumbai.pdfIn PDF document text
    • http://zisekajoreva.epizy.com/89435531842.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_off0000d8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F6 6580 bytes
SHA-256: be5cab59bcf7488f0f002567c4f5832eda8b0e0cb810ec9209bc071191e6ab46
font_01_sfnt_off0000ef6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6B 13376 bytes
SHA-256: 6d71b2224790280572e028c1fce686eeb7f9312fcb544bc43782154f5ff05d42

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