Malicious PDF — malware analysis report

Static analysis result for SHA-256 46d88aff8c15c287…

MALICIOUS

PDF

72.9 KB Created: 2021-03-02 22:40:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77b032e729618a954a714f31ab913407 SHA-1: 1f0c695238ab3e324ba5ede0698710a87bc1eb8e SHA-256: 46d88aff8c15c2876e73304857821a8167ba64d9157c71f3fe9a32ce4a96aeb1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm or SEO poisoning attack. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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://ponafet.ru/123?utm_term=onkyo+tx-sr604+no+sound
    • http://true-board1.club/the_norton_anthology_of_world_literature_shorter_third_edition_volume_13u1ut.pdf
    • http://org-fruit.space/what_are_good_exercises_to_lose_belly_fatja3ry.pdf
    • http://nukels.xyz/prezi_free_templates_workflowx73wj.pdf
    • http://berkeciftci.net/flowkey_learn_piano_apk6nxfy.pdf
    • http://bagomebefekixob.getenjoyment.net/gelesafepegemori.pdf
    • https://static.s123-cdn-static.com/uploads/4464878/normal_5fe542c9d4a29.pdf
    • http://55571.ru/manual_of_laboratory_and_diagnostic_testsfohu0.pdf
    • http://tells.fun/giant_tissue_paper_flowers_template03ff0.pdf
    • http://nesobaka7.xyz/hamilton_beach_ice_cream_maker_recipes5z82j.pdf
    • https://cdn.sqhk.co/goxobuve/iigfQ8F/toca_lab_elements_free_download_pc.pdf
    • https://static.s123-cdn-static.com/uploads/4495985/normal_5ffbbec805e14.pdf
    • https://cdn-cms.f-static.net/uploads/4471455/normal_6015b3bda6e47.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://soranodabiwegi.myartsonline.com/96799707816.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1bd.bin
a0f4a01b29e58efc3d01bfc22d53ab5cb87e7f0adb0db6c89f3589332e2aa2c1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BD 5256 bytes
font_01_sfnt_off0000f3cc.bin
f19966603b77a2409eed3dde1b613130426a98c91cedd1654c97ef95e93f0f4b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CC 10296 bytes