Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8923811a5bdd474…

MALICIOUS

PDF

84.3 KB Created: 2021-03-08 23:53:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e658bcfef94f3d989ca0529d363fba6 SHA-1: bf3bd332de6cefc6f115724c29b616b06d5af55c SHA-256: b8923811a5bdd47448ed205775622ab454c4193f44f9c9373c86521ef6dbbb6b
186 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, containing 30 external links pointing to various domains, many of which are hosted on disposable or suspicious platforms. The ClamAV detection and ML classifier further indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the extensive link farm suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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=acrosome+of+sperm+is+formed+from
    • http://kopalirigel.mypressonline.com/bimumobirunetomuveka.pdf
    • http://gutaluri.22web.org/aluminium_alloys.pdf
    • https://ledijonag.weebly.com/uploads/1/3/4/6/134689342/jipuv.pdf
    • http://cherrypimp.online/how_to_install_verizon_fios_wifi_extenderm77kv.pdf
    • http://zizodoroluxonaf.sportsontheweb.net/vujagasikixibevawoxevijej.pdf
    • http://copyrightsupportforlnstagram.com/masewafusutamunesupovisa89zds.pdf
    • http://jamotovoxut.mywebcommunity.org/57302931048.pdf
    • http://creditpm.com/cinderella_man_guided_questions_answers2vwav.pdf
    • https://fimulumalopa.weebly.com/uploads/1/3/5/3/135326017/68c38e8fbdef8c6.pdf
    • https://vepodiruwa.weebly.com/uploads/1/3/4/3/134374194/mefasinapagimez-sogegifefefopo-vuvufizu.pdf
    • http://wwwbcpzonasegura-viabcp.com/4_pics_1_movie_level_50_answersih0j9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_42b3d01c933742be8cc483734308d3ad.pdf?index=true
    • https://7b4e975e-109f-4397-a679-93e438ff1453.filesusr.com/ugd/c33f71_4df5aefb346d4bb6a54dc9c35f9748af.pdf?index=true
    • https://1b3fde16-7575-45ba-b40e-8916c64185ca.filesusr.com/ugd/8874e8_535096cb32744a4ca986e3dd66221032.pdf?index=true
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_2e4ba3ca9d8a42f986cef64515802fa7.pdf?index=true
    • http://zaxutakizet.epizy.com/bosch_dishwasher_silence_plus_44_dba_not_drying.pdf
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_924a10e97c95481791918f4b1c4aad32.pdf?index=true
    • https://1e438cd7-6f3b-42ac-a97b-d13a75fa135b.filesusr.com/ugd/0c268c_80ff59dd916b4cca8b579ce87311a2cb.pdf?index=true
    • http://vabopegimunufet.rf.gd/what_is_a_subnet_mask_and_how_does_it_work.pdf
    • http://pujusojup.epizy.com/cartoon_script_font_free.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_off00010c17.bin
a17f08b3df4c4c00ef7ceb6adf7c30eee1f5c06860130c2e9123cbd8ef573b40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C17 5048 bytes
font_01_sfnt_off00011d34.bin
65edd08771da8fb556d5b488ae10d752bb93fc34b286d673c508cb06335c1ca5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D34 11700 bytes

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