Malicious PDF — malware analysis report

Static analysis result for SHA-256 88fa7c606e59d65a…

MALICIOUS

PDF

90.3 KB Created: 2021-04-04 21:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2e439c975d1cd979db6418ec15c77926 SHA-1: 4b85bf58248c9432632346c0e7b01e4085534a48 SHA-256: 88fa7c606e59d65aa016f4c7ca78c70f44feee73145f8fd2bf73486802231069
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 or SEO spamming operation. The presence of a malicious ML classifier flag and ClamAV detection further supports its malicious nature. The embedded URLs suggest an attempt to redirect users to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/strik?utm_term=garrett+euro+ace+vs+250 PDF link annotation
    • http://blekrossi.ru/bissell_proheat_turbo_2x_partse9qk9.pdfIn PDF document text
    • https://cdn.sqhk.co/matijamaj/An5jchc/barbershop_cast_members.pdfIn PDF document text
    • http://appless.space/whats_the_best_compound_mitre_saw7oxtw.pdfIn PDF document text
    • https://cdn.sqhk.co/xopuxuvop/ijhjhhd/59966664385.pdfIn PDF document text
    • https://bakofegep.weebly.com/uploads/1/3/1/3/131382808/mozitixiludevema.pdfIn PDF document text
    • https://tesiligozi.weebly.com/uploads/1/3/1/4/131407846/miketuduniz_wexig_biruvajomefof.pdfIn PDF document text
    • http://kernig.store/implosion_never_lose_hope_full_apk_data6tbmo.pdfIn PDF document text
    • https://sipinawuzukefo.weebly.com/uploads/1/3/1/4/131410227/bc10435997c83.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/08249a22-ff58-42fb-aa27-5d9ebcdf298f/mozenajodafuvubavugujize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27900ce2-9c32-49c3-9cea-ef76934596bd/how_to_cite_a_mobile_app_in_apa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/343028eb-de6e-4615-b1b7-0875a50b9541/69594537185.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/351275b2-30e7-4d0b-a3a5-99f5ef34b6e9/buffalo_multi_function_rice_cooker_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e91e87b-f27a-4371-8f2b-7813f69290df/rozimiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8e3b4da-dce9-4e4d-8600-d5b519cd0079/fosugevagoloropatogapumez.pdfIn PDF document text
    • https://217ba8a6-026c-4a9e-b1ce-2eadff0a4a08.filesusr.com/ugd/3d7af5_baee19b085ec40c7927df5f20737d343.pdf?index=trueIn PDF document text
    • https://8ca15cf9-c5bf-4329-906a-32df3c7b5ab7.filesusr.com/ugd/4ca7f5_6ac8a1a9bdb94e458c417a20f6d47cfb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d3fa7fe-4649-4680-a57b-f9cef62eb4cf/gutilamepuko.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_off0001244f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244F 5252 bytes
SHA-256: e85d1b9796aa531b27a1969e5c635dbddfc22a2a47ba3b0b38033d26f54ced57
font_01_sfnt_off00013649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13649 11188 bytes
SHA-256: 463fe16ae05db28f577d9764d897a23ec108a81eaa9443c16dc5cf9e207a5a42

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