Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb8f3d2dbdfe756d…

MALICIOUS

PDF

79.1 KB Created: 2021-04-06 20:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6e070d373ff65adf4255dd9316314cd8 SHA-1: 95ae9bc01c83d1cceb68ef1724e6be951dbfac2f SHA-256: bb8f3d2dbdfe756d0cb4379a916cfc6341c621fcf23771799fcff177dbf756f7
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/strik?utm_term=2014+ford+mustang+owners+manual+pdf PDF link annotation
    • https://cdn.sqhk.co/zawatilirip/hhFkghD/hidden_objects_free_no_download_games.pdfIn PDF document text
    • https://cdn.sqhk.co/dagosasojo/hbgevib/66120376366.pdfIn PDF document text
    • https://cdn.sqhk.co/finulepaf/8aoOjj4/hill_climb_racing_2_pc_cheat_engine.pdfIn PDF document text
    • https://radefikifuru.weebly.com/uploads/1/3/4/7/134723330/kojifezi.pdfIn PDF document text
    • https://cdn.sqhk.co/nujidegowupi/jghQifl/new_guitar_love_ringtones.pdfIn PDF document text
    • https://rapekazojeroxe.weebly.com/uploads/1/3/4/6/134697974/xufetujusipow.pdfIn PDF document text
    • https://cdn.sqhk.co/jevunazuru/hhjbejg/furozisomufatuv.pdfIn PDF document text
    • https://boxesagako.weebly.com/uploads/1/3/4/5/134589877/napuf-toxojegebigu.pdfIn PDF document text
    • http://kiwedoro.66ghz.com/bear_archery_cruzer_rth_ready_to_hunt_compound_bow_package.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e5720c39-3c1c-4a52-9be9-509675281b5a.filesusr.com/ugd/0010c8_1dea19daa56745b79ecd0c7bd39cd893.pdf?index=trueIn PDF document text
    • https://2ea3657d-1c4c-40dd-8491-58aeeb8dc933.filesusr.com/ugd/18a85a_9cfd1f42954c4e3e9c4b11e13f71b5ef.pdf?index=trueIn PDF document text
    • https://e5baaea7-7007-41de-9367-4ebf3ed55875.filesusr.com/ugd/8e1900_6d9fe1c35a414b918334a95a75af6600.pdf?index=trueIn PDF document text
    • http://xemefalokoxor.epizy.com/did_actress_tanya_roberts_passed_away.pdfIn PDF document text
    • http://fipuxogililego.epizy.com/arturia_microfreak_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1394fa39-8790-4b62-95ac-378f15e151f4/jusaxiwizaxukete.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ac40766-26d2-4894-972c-3973230e142d/modern_refrigeration_and_air_conditioning_20th_edition_answer_key.pdfIn PDF document text
    • http://levasufut.rf.gd/mapivamu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e376832b-c52b-47c8-801c-739c30dabde3/229751496.pdfIn PDF document text
    • http://lulevewutowa.epizy.com/10945586634.pdfIn PDF document text
    • https://5c3e38fa-bf2d-4cda-bfdc-19e9a39f2227.filesusr.com/ugd/b3ada4_fd94956cbb81463e93e54ca3584e76bc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce8d7565-2be4-4877-94d2-6539755a8e66/xuluwinifebolopavopugiz.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E7 5772 bytes
SHA-256: 5fab56882505f75f7967f381edb6373eae214b16a575f4bd947eba9f17053d6f
font_01_sfnt_off0001089a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089A 11132 bytes
SHA-256: 6c8a1948b304bc9ff43dba04b94e0378697b2b6a6003d41694672308b9633b0f