Malicious PDF — malware analysis report

Static analysis result for SHA-256 52e927d03a8ad761…

MALICIOUS

PDF

87.0 KB Created: 2021-04-07 07:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2f48d5d75c43735ce7fc803858fb52a4 SHA-1: 2901cabd91032c15c1a4e93a1918e1929bf74311 SHA-256: 52e927d03a8ad761fef8081b9afff37767467f1056e2ade80b599c24ef48f87e
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious content. It contains numerous external URIs, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm. The document body, though heavily obfuscated, suggests a lure related to a product sale, likely intended to trick users into clicking the malicious link. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

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://xezojetit.ru/strik?utm_term=axe+fx+2+xl+plus+for+sale PDF link annotation
    • https://xetamoro.weebly.com/uploads/1/3/2/8/132815737/6086237.pdfIn PDF document text
    • https://tapizijivuvol.weebly.com/uploads/1/3/2/6/132696465/redezo-ludidabev-tefepajepof-manokexosu.pdfIn PDF document text
    • https://malomunadososep.weebly.com/uploads/1/3/5/3/135351096/f32ea401.pdfIn PDF document text
    • http://study-english-05.site/when_backing_a_vehicle_always_rememberf17s1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381098/normal_60637e760d9e5.pdfIn PDF document text
    • https://janepowowufevi.weebly.com/uploads/1/3/4/5/134506071/47f37bd3.pdfIn PDF document text
    • https://rovagurepuj.weebly.com/uploads/1/3/1/8/131856033/4220773.pdfIn PDF document text
    • https://roguvajodanuk.weebly.com/uploads/1/3/1/3/131379692/c548edf6dc75b7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455176/normal_6041cfb1d2c7d.pdfIn PDF document text
    • http://totalcreditcheck.info/rising_of_the_shield_hero_season_2_anime_planetvvcuh.pdfIn PDF document text
    • https://lopuxewununoj.weebly.com/uploads/1/3/4/7/134748711/dixelomedog.pdfIn PDF document text
    • http://teachost.com/hp_8600_printhead_part_numberoltwz.pdfIn PDF document text
    • https://kuwumezebuxe.weebly.com/uploads/1/3/4/1/134131528/fefasujabaj.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/baxunaf/5972269277.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/48414360891.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/lajolapuweluwugasi.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_off000113ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CE 5084 bytes
SHA-256: 9ae631b62f54ca6627f1a6b02c39934d2f2574821ddf5ba2add11ea852722ded
font_01_sfnt_off00012532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12532 12412 bytes
SHA-256: 756c158d21af103e4a5cf269f4d0179584bbfcf6491b522417943cd2fe0e02df

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