Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bfeda634a3075bc…

MALICIOUS

PDF

72.1 KB Created: 2021-01-21 14:20:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b7261db4dfef93cdaf03c09403c797a SHA-1: 74a388b3603bdccfc8489aacaf0c7e8420a03824 SHA-256: 9bfeda634a3075bcfe81d04f99edc5921a1a539f41cd5b214a4751cb92e7e837
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. While no scripts were extracted, the presence of numerous URLs and the ML classifier's high confidence score support the classification as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/aws?utm_term=american+truck+simulator+beta+1.+32
    • http://zemawage.22web.org/jovekofuga.pdf
    • https://duxoberadu.weebly.com/uploads/1/3/4/7/134718286/lawosumajimuw-wilireno-xufilamogudi-xenoxigub.pdf
    • https://jenazikefu.weebly.com/uploads/1/3/4/0/134017187/5889871.pdf
    • https://site-1166657.mozfiles.com/files/1166657/runkeeper_gps_track_run_walk.pdf
    • https://xonesomo.weebly.com/uploads/1/3/0/7/130739362/mabekovopaleto_tanabadexorab_dupujuvigevet_fetimitimujalep.pdf
    • http://kogemamumudun.22web.org/cincinnati_annual_weather_report.pdf
    • https://lumovomudin.weebly.com/uploads/1/3/4/7/134704265/ragojoz.pdf
    • https://suwesinorilofev.weebly.com/uploads/1/3/4/0/134096988/38c4f06a36fb.pdf
    • https://static.s123-cdn-static.com/uploads/4470027/normal_5fca998cc0bb1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vupikefugogulup.epizy.com/adel_fingerprint_door_lock_manual.pdf
    • http://keximidurowu.rf.gd/new_amsterdam_episode_guide_imdb.pdf
    • http://wobirazegezuw.epizy.com/xidotavoguvukawumanusobam.pdf
    • https://s3.amazonaws.com/gadumagabusodel/72418301622.pdf
    • http://piwirapofo.epizy.com/delicious_desserts_word_search_answers.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_off0000db1a.bin
a8a3eddec41a19bbd1820406686172e981c4bb3b349fda97f17a1295e4d419a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1A 5520 bytes
font_01_sfnt_off0000edcf.bin
20230306e30746c813fda0349bb757fa45ee62eb96ae767ebb76f8a6fdc72d2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCF 10624 bytes

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