Malicious PDF — malware analysis report

Static analysis result for SHA-256 011e41d8fd0043c7…

MALICIOUS

PDF

84.7 KB Created: 2021-04-11 08:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b79a71527ef77dedb7872130a24762a6 SHA-1: 5b51ec66b0ee01a5d5f136c83b54d2e51aa6afcb SHA-256: 011e41d8fd0043c79213430fd422020f3e58073037086be9eae225763da11259
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm or phishing attempt. The primary malicious URL identified is https://jacksth.ru/strik, which is likely used to redirect users to further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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
  • 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/strik?utm_term=wu+tang+documentary+showtime
    • https://jitezawedum.weebly.com/uploads/1/3/4/6/134688152/4afe057.pdf
    • https://cdn.sqhk.co/romilononove/8hhbRid/dj_mix_song_app_download.pdf
    • https://cdn.sqhk.co/widafopaj/K7MNiar/top_100_house_djs_2018.pdf
    • https://kodetinerimaguw.weebly.com/uploads/1/3/5/3/135347088/2944e5728be.pdf
    • https://cdn-cms.f-static.net/uploads/4470016/normal_6013ed486dc55.pdf
    • https://cdn.sqhk.co/janezewufaj/Y9dhazJ/free_powerpoint_2013.pdf
    • https://cdn.sqhk.co/gederanew/icnjiiB/rock_band_hero_xbox_one.pdf
    • https://dawanuma.weebly.com/uploads/1/3/4/3/134305997/3014115.pdf
    • https://cdn.sqhk.co/sebuwemid/i0jagcX/69185769471.pdf
    • https://static.s123-cdn-static.com/uploads/4465142/normal_5ffeb4c794c39.pdf
    • http://fezibinuzot.iblogger.org/68247716203.pdf
    • https://cdn.sqhk.co/kewawukufiju/jhhBcjf/84885189597.pdf
    • https://tumugisoluxadez.weebly.com/uploads/1/3/4/6/134601474/vudiwopine_sovifeberej.pdf
    • https://tukowozurowogof.weebly.com/uploads/1/3/4/4/134440104/tumixusekufotovuleru.pdf
    • https://cdn.sqhk.co/budufunewuf/hhjihP0/uk_money_laundering_reporting_officer.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/facc77b6-4da2-478f-971d-9a4d9412485d/boxizizito.pdf
    • http://zijemuviwovo.rf.gd/xulojafitub.pdf
    • https://uploads.strikinglycdn.com/files/7557c7e2-74fa-45f4-bd41-b11d9fc1d9ce/easy_origami_with_printer_paper.pdf
    • https://uploads.strikinglycdn.com/files/621e224c-84b6-4f8c-9d06-8808e9abc1a5/the_secret_garden_cast_album.pdf
    • https://uploads.strikinglycdn.com/files/e21dc0ab-7dd9-4693-acb2-88676bdff788/naduxepomotenume.pdf
    • http://kugidozu.epizy.com/23435831007.pdf
    • http://pajotevijonawo.rf.gd/65804025147.pdf
    • https://uploads.strikinglycdn.com/files/a6619e40-101f-4c61-ab20-305bbfdf5090/how_to_get_crossfit_certified.pdf
    • http://radagosedapisat.epizy.com/gagizikiwujurogigomoj.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd38.bin
78809f06b1894f235bff2e7d4112bc98f418ee8c6f30e38b3f7f826257d753c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD38 5408 bytes
font_01_sfnt_off00010f7b.bin
542157270bb7195f86e7f038c608864f96467ce01646d819f4428dc38e743c92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7B 11200 bytes
font_02_sfnt_off00013594.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13594 4324 bytes

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