Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f4e6bb4e36c0dc0…

MALICIOUS

PDF

87.6 KB Created: 2021-02-24 02:14:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: fbb9b9b1ead3686fc7794a946c825607 SHA-1: 3813ecb3d5c9df570d5735ed79d32c7637c7b3fe SHA-256: 6f4e6bb4e36c0dc01e9e2d09ffb4fd44fe8b339ab3d1ef536b31a75b4a1876f7
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 ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and musical chords, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/123?utm_term=acorde+de+re+mayor+en+piano PDF link annotation
    • https://cdn.sqhk.co/fejisedetu/cjckpYG/facebook_live_local_news_roku.pdfIn PDF document text
    • http://bitcoins-profits.com/gun_muzzle_flash_effectsm5u6y.pdfIn PDF document text
    • https://cdn.sqhk.co/fugolamudara/CLijie7/starfall_calendar_october_2015.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410194/normal_60119ac2b7d9d.pdfIn PDF document text
    • http://4gusevshop.website/the_caves_of_steel_bookxg05y.pdfIn PDF document text
    • https://cdn.sqhk.co/golemejexeno/ggjgzje/69786227349.pdfIn PDF document text
    • http://wordsideget.top/susixesuwamatewapovitew33808.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446166/normal_5ff76e3476a31.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/XiajaUw/bidamekefafixupesezike.pdfIn PDF document text
    • http://razvivatel.blog/ratigomitakirejagejuz92rda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383698/normal_5fec6bcc72fd4.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/KgfwhcA/867176464.pdfIn PDF document text
    • http://greatholl.com/27724207119jnuj.pdfIn PDF document text
    • https://cdn.sqhk.co/giripiponi/xUvifgf/tiboludivobedasunewe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sikejilewiz.epizy.com/bangla_new_song_audio_2018.pdfIn PDF document text
    • http://sewogixura.rf.gd/kowikivelelonifutima.pdfIn PDF document text
    • http://zerekigukazaja.epizy.com/driving_school_2017_apk_android_oyun_club.pdfIn PDF document text
    • http://vomematomeze.epizy.com/wasewe.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn 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_off0000f53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53F 5100 bytes
SHA-256: 51684feb50452e46ec678d0e133e524d70f0773dc8d859e7d08ab639eef5e04e
font_01_sfnt_off00010683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10683 3720 bytes
SHA-256: 40ef96da86b6123d577d475be460de15c41b9ca7393a8e650be4e9942aa3c64b
font_02_sfnt_off000111e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E5 12296 bytes
SHA-256: 12bad0edcc8f1acd4ba4a3dc37dec225cc9e8d7bd74b8572839e8d7b601f51e2
font_03_sfnt_off00013a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A0A 16120 bytes
SHA-256: 2cfc97915d250804213c9b0e6ad261e0979cd38371fb36ec9174dea58a153a3e

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