Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6837c0933d5e787…

MALICIOUS

PDF

84.6 KB Created: 2021-03-26 10:13:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 52cd9e856ef681b34e81acdad331a6cf SHA-1: d0362ff1013ec5b0709149b064d5ee8062872f26 SHA-256: c6837c0933d5e787c4dd9d915b48311d2d216b867e5a12f55d216dd952628378
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. The document body, though heavily obfuscated, contains text related to 'bespoke software pdf' and application details, suggesting a lure. The presence of numerous external URIs, many pointing to disposable hosting and link farms, strongly indicates an attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a tactic to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://bologen.ru/award?keyword=bespoke+software+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4385847/normal_5fe4aa39cef32.pdfIn PDF document text
    • http://microbladingcertificationdfw.org/at_lp120_cartridge_alignment7qg1p.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/figurative_language_examples_simile.pdfIn PDF document text
    • http://gazedalepi.sportsontheweb.net/1554350272.pdfIn PDF document text
    • http://mumaposogataj.22web.org/automobilismo_d_epoca_febbraio_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/hollywood_movies_2016_list.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372682/normal_5fe83476bccb4.pdfIn PDF document text
    • https://javudufopatoka.weebly.com/uploads/1/3/1/6/131606124/zibiponu-mekijivibifeke-ropebebup.pdfIn PDF document text
    • http://blognews.top/nudebezewupepem363ic.pdfIn PDF document text
    • http://zhigina.ru/quantitative_techniques_for_businessygpkf.pdfIn PDF document text
    • https://moluxoket.weebly.com/uploads/1/3/2/6/132682852/karelekemanisew_soralimeneji_kaxajinuvuvizi_bubug.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/lefipolirodajik.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/nobagodozatuvalap.pdfIn PDF document text
    • http://medicalpracticementor.com/bikogozakuruwevesoga3vj6c.pdfIn PDF document text
    • https://milelujip.weebly.com/uploads/1/3/4/8/134861654/04c55c7d7276e5.pdfIn PDF document text
    • http://rajajime.mypressonline.com/ranusokoxukujunutigu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kifesafijupesob.onlinewebshop.net/39856158289.pdfIn PDF document text
    • http://dowafirowelumex.atwebpages.com/aphasia_book_free_download.pdfIn PDF document text
    • http://fafovinipola.epizy.com/58207024582.pdfIn PDF document text
    • http://kigaxaxoguwebu.rf.gd/80667143368.pdfIn PDF document text
    • http://gujodupilewibo.epizy.com/ramiragazazegosujoseka.pdfIn PDF document text
    • http://vevemaj.rf.gd/renaissance_art_and_music_crossword_puzzle_answers.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99A 5208 bytes
SHA-256: ae66d6771c5ce5154123f78d1d8707671ddf4ab65d92f24a94040d7997bf14fe
font_01_sfnt_off0000fb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB74 1892 bytes
SHA-256: bafcfd1afab53a3f4678d1246fd71a846553f840a222806fad580a24350d2e76
font_02_sfnt_off00010492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10492 12840 bytes
SHA-256: 3dfc10fd5784426235ba068a50a6bbb9dba834e80477b3ec9e89771b91e8dd39
font_03_sfnt_off00012dee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEE 16092 bytes
SHA-256: c9557d91917e40dbb2ce09b7ef560a04a9a832ffe2ebcac6b50408a58351272e