Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f8b4bac61b39fc6…

MALICIOUS

PDF

76.7 KB Created: 2021-04-02 01:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d7ff3b10936f5569ed7cfcd0c1f62506 SHA-1: d098d9baf959c31e9d711dbd9cbc68202e71fcfa SHA-256: 7f8b4bac61b39fc66336096ebf538a62db193c5b783bac538a57fee393b45f89
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning model and ClamAV, indicating malicious content. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users. The presence of 'wkhtmltopdf' in the metadata and the nature of the URLs suggest a phishing or malware distribution attempt.

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://nipisod.ru/123?utm_term=android+bytecode+instrumentation PDF link annotation
    • http://tesekal.mygamesonline.org/lalerugatu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480590/normal_5fd17ae4bd291.pdfIn PDF document text
    • http://wifunagidoli.mypressonline.com/what_to_eat_at_taco_bell_on_weight_watchers.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/84557809941.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455381/normal_5ffbc50b48ef6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499653/normal_6003f133b5ae1.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/galaxy_j7_2016_sm_j710fn_firmware.pdfIn PDF document text
    • http://jetinaxisodew.mypressonline.com/glossary_of_history_terms.pdfIn PDF document text
    • http://jalularuxubiw.iblogger.org/35918082624.pdfIn PDF document text
    • http://rekugegik.scienceontheweb.net/kivupujoberadowarotefuzu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426409/normal_603423b2bd69c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454672/normal_60344a787ca98.pdfIn PDF document text
    • http://barajofa.mywebcommunity.org/xubigobesojebanuxur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bodudubabafixe.rf.gd/gmat_sample_essay_questions_and_answers.pdfIn PDF document text
    • http://kokalukavevip.epizy.com/navipezozanawipopo.pdfIn PDF document text
    • http://fusarafabar.epizy.com/chicago_manual_of_style_research_paper_format.pdfIn PDF document text
    • https://058da8ce-bb30-4b8c-81eb-8903018cac65.filesusr.com/ugd/ab745b_a7782d1175044f2bb5edef86f09853f5.pdf?index=trueIn PDF document text
    • https://b585a76b-fab5-4024-b0d2-f3ad95444197.filesusr.com/ugd/404203_d0bdfbc9501443ccb3003f9a925902c6.pdf?index=trueIn PDF document text
    • http://ganesuk.epizy.com/gofusigerabizezorizawedar.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08B 5164 bytes
SHA-256: 71675073d389e8981cd5046c82afc8a7ddc6fed61c9ba8b6fe66cc73901a59db
font_01_sfnt_off0000f1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F8 11100 bytes
SHA-256: 16d5c984a54ad3081c1bda2ab6d78eba2c9503538ef6866c09d1fb44968f9fa9
font_02_sfnt_off00011705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11705 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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