Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb5807a83946bf0…

MALICIOUS

PDF

73.6 KB Created: 2021-03-04 16:57:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f45ed5d1e342c81a5ed32143c8e238d9 SHA-1: e273e89bb8556174f2673b4dd192454ff63f2f76 SHA-256: efb5807a83946bf0e874fce90eb1935c4eacfbaaa3d5f620b62cb8dfdafcc7e2
186 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The document contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm designed to direct users to potentially malicious content. The primary URL, https://xezojetit.ru/strik?utm_term=why+does+my+bose+soundlink+keep+turning+off, appears to be a lure for users searching for technical support, which is a common phishing tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=why+does+my+bose+soundlink+keep+turning+off PDF link annotation
    • https://cdn.sqhk.co/jedugifaxido/jJ0jigh/financial_times_mba_rankings.pdfIn PDF document text
    • https://cdn.sqhk.co/tedubifo/icicijW/new_monster_truck_racing_simulation_2020_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/minofavazu/f5CHieQ/98708348676.pdfIn PDF document text
    • https://cdn.sqhk.co/tavaxikanabu/gcl1RKY/fury_road_villain.pdfIn PDF document text
    • http://rineset.xyz/zanemekidipokat8v8k.pdfIn PDF document text
    • https://cdn.sqhk.co/nejibija/gggjgdC/shoneys_crossroads_mall_hours.pdfIn PDF document text
    • http://titonigofitazi.iblogger.org/wildwood_habits_of_heart_and_mind.pdfIn PDF document text
    • https://cdn.sqhk.co/kominepoli/h5jhNWd/sexaxutemofuwogenisinatuf.pdfIn PDF document text
    • http://marketitaly.pro/viktor_frankl_between_stimulus_and_response_bookrcy3y.pdfIn PDF document text
    • http://temppicture.xyz/41662158979srhdd.pdfIn PDF document text
    • http://fastpeysistem.online/ar-15_lower_receiver_machining_dimensionst1nav.pdfIn PDF document text
    • http://magnetfix.store/79543405994eo0lw.pdfIn PDF document text
    • http://hempmap.ru/math_fraction_worksheets_for_7th_gradedshn1.pdfIn PDF document text
    • http://cabinetsop.xyz/baby_girl_fall_outfits_amazonba74k.pdfIn PDF document text
    • http://batmbatm.ru/dd_dm_book_5e6rb4a.pdfIn PDF document text
    • https://cdn.sqhk.co/jelivapizivo/fggvjbc/daily_cleaning_checklist_for_office_template.pdfIn PDF document text
    • https://cdn.sqhk.co/pobusafi/gRSiaRE/48806986235.pdfIn PDF document text
    • https://cdn.sqhk.co/nomelafu/gfhhSje/88268191037.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/fjbjahe/tool_box_kit_home_depot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://50b44c92-959e-4a15-bf83-93d6b2b518d6.filesusr.com/ugd/3ed44c_9c38c16848434f5a918f6b253c970b1d.pdf?index=trueIn PDF document text
    • http://kofufinaniba.rf.gd/puritan_bennett_840_service_manual.pdfIn PDF document text
    • https://d4508431-0eee-4913-ac2a-2ec907ed9b18.filesusr.com/ugd/12daa7_9e5f5a00abf84f8081f3d52e2e25e5ac.pdf?index=trueIn PDF document text
    • https://0621cc9e-6449-4e8a-a8bd-baee9ad62a2c.filesusr.com/ugd/affb4a_dc4fefb109c14f488d903e2602089791.pdf?index=trueIn PDF document text
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_3b63de02220f47bc8f007556f711c519.pdf?index=trueIn PDF document text
    • https://e824aeac-d22a-4b45-bb3c-17051d6ee04f.filesusr.com/ugd/de60da_99468c972b694ffd935aef8921211021.pdf?index=trueIn 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_off0000e137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE137 5564 bytes
SHA-256: 26f9078489376802872d2ab0bf1dfa7bcbcce066f3f81b69ee396d31503c838c
font_01_sfnt_off0000f40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40C 10852 bytes
SHA-256: 1566fb2380d3116cddf24d00bd4ecd68751f43afbd23c4e772c0535c3e39bb44