Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2f088667e2b4c6f…

MALICIOUS

PDF

74.6 KB Created: 2021-03-31 03:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: a4ba03a1e9fb6615ce5392c7cf505d59 SHA-1: 55d8a5509173b0d006251166cbeec04ddcdf2a17 SHA-256: b2f088667e2b4c6fdfc66c37a9e17fee19c21775818f98de0c009bd7ad4b4ab9
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically related to phishing. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity designed to redirect users to potentially harmful sites.

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://nipisod.ru/123?utm_term=sql+server++2008+r2 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383131/normal_5fc6b0971f7f6.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvexudid/ihuRhcG/39147957929.pdfIn PDF document text
    • https://cdn.sqhk.co/wejawujagi/oL7iiR3/solemaliwuvamemave.pdfIn PDF document text
    • https://cdn.sqhk.co/boremagu/hbrCPWG/background_check_authorization_form_ny.pdfIn PDF document text
    • http://vuwiwetidajin.mywebcommunity.org/hallelujah_chords_g.pdfIn PDF document text
    • https://vijopafixav.weebly.com/uploads/1/3/1/6/131636601/1263844.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485016/normal_602f1cd01c988.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454682/normal_604f3fdd5486b.pdfIn PDF document text
    • https://cdn.sqhk.co/lizoxazafofe/Qagjcih/81811371413.pdfIn PDF document text
    • https://zidimegaga.weebly.com/uploads/1/3/0/9/130969389/4368068.pdfIn PDF document text
    • http://zesenadozefut.sportsontheweb.net/family_budget_planner.pdfIn PDF document text
    • https://wowujisalot.weebly.com/uploads/1/3/4/3/134349860/xutogupegodunino.pdfIn PDF document text
    • http://gejurabek.getenjoyment.net/what_does_orange_mean_in_psychology.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460968/normal_5fd679480987d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494866/normal_603eb2bbd3447.pdfIn PDF document text
    • https://tatefazaseg.weebly.com/uploads/1/3/4/0/134016926/ef77aa44f.pdfIn PDF document text
    • http://xibevajisigidig.22web.org/zarubofapareraduma.pdfIn PDF document text
    • https://cdn.sqhk.co/fowipovoji/bJjy9GU/gifufofizenorukak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lafibuwed.rf.gd/chyawanprash_full_song_pagalworld.pdfIn PDF document text
    • http://rilefijej.epizy.com/smart_audiobook_player_apk_mod.pdfIn PDF document text
    • http://kategemum.rf.gd/12317439246.pdfIn PDF document text
    • http://vemevusakeke.epizy.com/41780269102.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_off0000d9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A0 5228 bytes
SHA-256: a587c1fdf95635be2fa74bd18f8f44fedd62e4a5f128e8dcbafd5e0131aeb9ed
font_01_sfnt_off0000eb8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8A 21476 bytes
SHA-256: e149e6f6ae14b3c76bbebc1022c0d514a01c19c325aeef25080f2761a0267365