Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a3605aa4bb8ca3a…

MALICIOUS

PDF

78.7 KB Created: 2021-03-01 10:05:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 0daad6d4d83caf589f5c1593550d8fe7 SHA-1: 531679d4de0836d7689e094cbbd2c79a345e9235 SHA-256: 3a3605aa4bb8ca3a2e548521e8d9bef5fe73cfd3e6dbbf1d61920156d64ad060
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for SEO manipulation or to serve as a distribution point for further malware. No scripts were extracted, but the sheer volume of external links points to a coordinated effort to direct traffic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/wix?keyword=ikea+oven+manual PDF link annotation
    • http://rumurel.mywebcommunity.org/smart_board_online_activities.pdfIn PDF document text
    • http://durikudu.iblogger.org/sankha_sankha_bjd_song.pdfIn PDF document text
    • https://cdn.sqhk.co/nokowifupe/J8gdYzQ/sapipetuzonukasezof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384819/normal_5fe1d93072fba.pdfIn PDF document text
    • https://cdn.sqhk.co/dojidavos/ieggTii/fire_skull_parallax_go_launcher_theme.pdfIn PDF document text
    • http://diriluma.22web.org/mebodar.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/bzjeGxA/trap_bunny_bubbles_lyrics_pj.pdfIn PDF document text
    • http://xidasetetobuge.scienceontheweb.net/31939015286.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461484/normal_601652e7828c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384484/normal_6011d77f6b243.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466661/normal_5ff112548dd6a.pdfIn PDF document text
    • https://cdn.sqhk.co/juxerawabuf/hageuhb/how_to_play_rock_and_roll_guitar_riffs.pdfIn PDF document text
    • https://sararilaba.weebly.com/uploads/1/3/1/4/131482808/4048212.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425229/normal_600a83a6c6a49.pdfIn PDF document text
    • http://beviluxenumiliv.mywebcommunity.org/kidde_i4618_firex_hardwired_smoke_alarm_with_battery_backup_manual.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://nupuzawov.onlinewebshop.net/small_business_position_titles_list.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDB 4372 bytes
SHA-256: 0c8adae8f48a6103052f8fb91cf758bdf34441296504e8886626ed56069d7530
font_01_sfnt_off0000fb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9C 10664 bytes
SHA-256: f0f190aa04e5a7fa5421c7faa1f40b34873e3d0dbb95e6d1e0435532a4ff0b44
font_02_sfnt_off00011f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8C 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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