Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b331ec230fb61f8…

MALICIOUS

PDF

95.0 KB Created: 2021-03-21 05:58:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 987b4d0b61a54dd30f46e18ab34c470d SHA-1: 4ecd10066166ed5f25b320bd714508daf1feba95 SHA-256: 8b331ec230fb61f845deb40fa6e9f3e681c083b9e3defdc233b76cb447230cb7
186 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many of which are on disposable hosting and utilize UTM parameters, indicating a link farm designed to redirect users. The primary URL observed is `https://ponafet.ru/strik?utm_term=trimble+business+center+download+mac`, suggesting a lure related to software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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.
  • 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/strik?utm_term=trimble+business+center+download+mac PDF link annotation
    • https://cdn.sqhk.co/bowewulaxam/jiMjdge/shark_bite_fittings.pdfIn PDF document text
    • https://lomofoxagut.weebly.com/uploads/1/3/4/5/134524577/ropevaxobefubuk_rifakamevamir_xuviweluj_rozomo.pdfIn PDF document text
    • https://xuwogojike.weebly.com/uploads/1/3/1/3/131380868/labis-tuvudonuw-lekofu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476925/normal_6001e542bbe69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407303/normal_603cf2c8c0e87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417145/normal_602e394b513c7.pdfIn PDF document text
    • https://kolojadulosa.weebly.com/uploads/1/3/1/3/131397946/guvuposobigis-kupol-jogof.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/ibjdhcI/movasutodilobemomadulu.pdfIn PDF document text
    • http://lodixewovufosa.iblogger.org/apple_desktop_backgrounds.pdfIn PDF document text
    • https://xidelesa.weebly.com/uploads/1/3/4/4/134498911/govojig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494868/normal_5fc955458e896.pdfIn PDF document text
    • https://cdn.sqhk.co/xasomegupur/eha95hf/61355213134.pdfIn PDF document text
    • https://tejukikefuxod.weebly.com/uploads/1/3/4/7/134703803/3750615.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://uploads.strikinglycdn.com/files/95cee145-8548-4106-b5b6-2059a7911dde/what_is_religion_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12e2881d-1cfa-4357-b0bc-8a8b662bd55d/95515419940.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/659b1c70-c4e7-41d3-98ad-5ed07a23ef72/mawir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20326da2-3a70-4169-9071-f69efce2676d/28935177675.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4691c24-d0dc-4999-a642-09874cdef4fe/breville_juicer_800jexl_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e319f9a-959b-4e00-b3e5-bab98b5132b0/pidira.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7319a084-8bb0-4ca7-a029-c9b4e5cb7f15/boss_audio_bv9386nv_steering_wheel_controls.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0abbc030-c368-4764-919f-4b3f4ffd8c69/adding_and_subtracting_mixed_numbers_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49453c15-f7e4-4d4d-9270-cdba1f7b5c40/76316494066.pdfIn PDF document text
    • http://zadabodemuliju.epizy.com/washington_dc_travel_restrictions_jan_2021.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12534 5148 bytes
SHA-256: fe6b45720956afdb013732e813f354ef921ba52a134f3a90e0e2e35da9ce4689
font_01_sfnt_off0001369c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1369C 12976 bytes
SHA-256: b86f691c4bb09ee1851717496249bee206f36d398f4513a9fa55cf6156e08a95
font_02_sfnt_off0001602e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1602E 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3