Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a1f8cc174fc7b6…

MALICIOUS

PDF

67.1 KB Created: 2021-03-29 17:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 52f03ceb57d990671a027c3ff1e3d3ee SHA-1: 01f415668310a1e9d02f95f11c1949261c589b24 SHA-256: 33a1f8cc174fc7b6e20da3737425e7ce45a0d5665e736f01dd5778df4a555c75
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'kuzutuzo.ru' and a heuristic indicating it's a link farm on disposable hosting. The document body, though heavily obfuscated, appears to contain keywords related to job searching, suggesting a lure to trick users into clicking the malicious links.

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://kuzutuzo.ru/strik?utm_term=part+time+technology+jobs+houston PDF link annotation
    • https://basavorulifa.weebly.com/uploads/1/3/4/8/134899730/f7f32e32b240.pdfIn PDF document text
    • https://bomejafir.weebly.com/uploads/1/3/4/7/134725936/795db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465709/normal_5fd73206ef27a.pdfIn PDF document text
    • http://white-x.fun/507249215480q3dx.pdfIn PDF document text
    • http://1xbet-registr.site/36374641894az5d5.pdfIn PDF document text
    • https://vamekatowozi.weebly.com/uploads/1/3/0/8/130814347/kedenepudikep_mudiwedo_muzodaxefuvaru.pdfIn PDF document text
    • http://wunuwivibegajim.22web.org/the_broken_way_ann_voskamp_amazon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376870/normal_602deeb62ef45.pdfIn PDF document text
    • http://potenciy.xyz/wikewafoflyr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lobakixadob.epizy.com/ashrae_handbook_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/97421853835.pdfIn PDF document text
    • http://zirafefovijab.epizy.com/relaciones_peligrosas_libro_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/didefejifu.pdfIn PDF document text
    • http://falalovoxiwada.epizy.com/50304843225.pdfIn PDF document text
    • http://rewelopax.rf.gd/longport_nj_fishing_report.pdfIn PDF document text
    • http://familule.epizy.com/pilofimadurusave.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_off0000cabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABF 5532 bytes
SHA-256: f4ad85cadced70e4ec38380b2d3516148c4104017892219df15504a55b66b71c
font_01_sfnt_off0000dd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6E 9852 bytes
SHA-256: 090494663729098f72bdca6acdf6f6ad83e2d8dd897c1621525cf0f1473109c7

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