Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1906dc4e302f0c0…

MALICIOUS

PDF

71.0 KB Created: 2021-02-10 16:43:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: bc81cb5355dceb9e1fc732e0bfcb744d SHA-1: cad535b30ada86d1c5d141ef624018eec30e0574 SHA-256: c1906dc4e302f0c08c33314556a087be841e33f64917b9e0b77588831275e2fd
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 detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm or phishing operation. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest the document is designed to redirect users to malicious websites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/123?utm_term=a+sound+of+thunder+answers+study+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452392/normal_5fd3aa7313352.pdfIn PDF document text
    • https://cdn.sqhk.co/rapowipijes/ggQgdVt/muxifagujekeze.pdfIn PDF document text
    • https://lufalejovi.weebly.com/uploads/1/3/1/3/131380058/4248509.pdfIn PDF document text
    • http://runolive.com/tuzulisegonin4kwhu.pdfIn PDF document text
    • https://cdn.sqhk.co/mepapogivoma/jnifajj/nibitusesilom.pdfIn PDF document text
    • https://mokoxobijukox.weebly.com/uploads/1/3/4/3/134321678/gowidusakumeduzezuse.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368952/normal_6007c919c52cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465545/normal_60183d6d6e6f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418001/normal_5fe9e3af6e307.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409395/normal_6000adb06c5c6.pdfIn PDF document text
    • https://bozuwosumexoxal.weebly.com/uploads/1/3/2/6/132682772/rokepibalamid.pdfIn PDF document text
    • http://nesobaka3.xyz/kedovejulijelopubatotf7dp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463009/normal_5ff758cd2ed55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426062/normal_601749fbeb07c.pdfIn PDF document text
    • http://dommasters.site/moodle_complete_tutorialg4zkk.pdfIn PDF document text
    • https://cdn.sqhk.co/lesasafo/igcVTkm/97936685087.pdfIn PDF document text
    • http://tertov.xyz/wwe_2k14_ps2_iso_game_downloadhcw34.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/nedijowewoded/alight_motion_mod_apk_latest_version.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/kaspersky_antivirus_apk_full.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/run_apk_in_android_studio_emulator_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/fedepisetavadipijevatikot.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/mikiwexagubibidopupam.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_off0000db3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3F 5320 bytes
SHA-256: 7888f3cb3ace9ed668de5cd2366224b2e4f6bcb75a5393bebee47c205a9bef05
font_01_sfnt_off0000ed6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6E 9748 bytes
SHA-256: ff7447938c640eb86aad211083a28ddc2fdbdad25e7d8ca0c4abbad87895f47f

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