Malicious PDF — malware analysis report

Static analysis result for SHA-256 8406268d9484834c…

MALICIOUS

PDF

76.7 KB Created: 2021-01-13 02:04:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2bf67471153e073cdbc4e748d7fd5a1a SHA-1: 3b5b1f075a0781cdd8c93d51ed9762628cfb3b34 SHA-256: 8406268d9484834ca36f79ba3e34a62f840792b4c059f9885849fa0fe7f3d4d2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting services, and is flagged by heuristics as a link farm designed for phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/aws?utm_term=arrangement+of+electrons+in+atoms+answer+key PDF link annotation
    • https://kejedaxuz.weebly.com/uploads/1/3/4/3/134355680/e9f06.pdfIn PDF document text
    • https://site-1171866.mozfiles.com/files/1171866/54555374077.pdfIn PDF document text
    • https://site-1176700.mozfiles.com/files/1176700/royal_followers_for_instagram_app_download.pdfIn PDF document text
    • https://site-1168232.mozfiles.com/files/1168232/bash_scripting_cheat_sheet_linux.pdfIn PDF document text
    • https://site-1168507.mozfiles.com/files/1168507/hungry_shark_world_hack_ios_13.pdfIn PDF document text
    • https://site-1171714.mozfiles.com/files/1171714/25638536463.pdfIn PDF document text
    • https://site-1168078.mozfiles.com/files/1168078/zujer.pdfIn PDF document text
    • https://site-1171826.mozfiles.com/files/1171826/oldies_remixes_on_spotify.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417220/normal_5fa0f10e63524.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427295/normal_5faf55263feed.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
    • https://s3.amazonaws.com/megelugik/abcd_2_movie_3gp_video_song.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_off0000e11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11B 5236 bytes
SHA-256: 1ac163206c56e9d35e6aa46d7e50fa195f379e5a7d5c82eb199df135de01dd7d
font_01_sfnt_off0000f2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E1 10688 bytes
SHA-256: 8d06f324c61cff6b090a1bba0b3f45653c48b14eaa448c7fa2d524d1498e011b
font_02_sfnt_off00011783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11783 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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