Malicious PDF — malware analysis report

Static analysis result for SHA-256 def9ab23b156a314…

MALICIOUS

PDF

81.4 KB Created: 2021-04-09 19:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7d1285f1523b4e2d04554a9957438737 SHA-1: eb77cbe7dae73c0f245f11901391cf40df9124b1 SHA-256: def9ab23b156a314e15eb6e699a9e1c7d2a521c25ea2e36f88dc3a6dd0877c00
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, and one primary malicious URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the PDF structure suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/strik?utm_term=can+i+use+my+wall+street+journal+subscription+on+kindle PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464539/normal_602738e35f199.pdfIn PDF document text
    • http://xutusupuz.22web.org/89205229988.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403276/normal_600efd09c12c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382627/normal_60114551b727f.pdfIn PDF document text
    • http://galajikimozupu.iblogger.org/puwebogumifibupobu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413865/normal_60658c82a9d50.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_77717dc8a1cc4d0dacf3716e2d7ef71e.pdf?index=trueIn PDF document text
    • https://e86c6366-0652-46cb-9e1f-5633a133dba9.filesusr.com/ugd/510a18_9cc633e286134b58ac1674a73828c6f6.pdf?index=trueIn PDF document text
    • http://zepogofeto.epizy.com/64253377368.pdfIn PDF document text
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_7624a9f9e77643d5b741f6a24cbe0ae2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sewamos/abc_female_sports_reporters_australia.pdfIn PDF document text
    • http://nikirijokagaza.epizy.com/materiales_metalicos_en_la_construccion.pdfIn PDF document text
    • https://aca56392-15ae-48e8-982c-fdf6c4ac0dc3.filesusr.com/ugd/00c070_74d3eaccacd247a7ae394dacf129bef9.pdf?index=trueIn PDF document text
    • http://netupizorazez.rf.gd/27754886035.pdfIn PDF document text
    • http://gugefojekasarul.epizy.com/quimica_organica_agamenon_roberto.pdfIn PDF document text
    • http://puzuzebud.epizy.com/csc_attestation_process_checklist.pdfIn PDF document text
    • http://nofifejagarenut.epizy.com/kalilezuduxu.pdfIn PDF document text
    • https://2987c0f4-171e-4473-b3f1-a5468658115b.filesusr.com/ugd/75ff8a_25867b46acc140b5b0a32d2b0e77357b.pdf?index=trueIn PDF document text
    • https://aed0ee3a-d217-4696-a563-de9ff15d6c37.filesusr.com/ugd/f80e3f_5c23f5cd8c3740b790c8823b201bec95.pdf?index=trueIn PDF document text
    • http://muxenad.rf.gd/telugu_quiz_games.pdfIn PDF document text
    • https://332892e0-6a2b-40ad-946e-e7c92c61c867.filesusr.com/ugd/3e5d97_3976cd1ef1a341acb8096605a182471f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xowasosuf/adobe_audition_3._0_keygen.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_off0000fee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE6 5600 bytes
SHA-256: 30d17461546fc393e86b6bf5f12235385858e43c09ed47e48855565935b7e44f
font_01_sfnt_off000111e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E8 11060 bytes
SHA-256: beb285480506682666521028993eeaf07fd45b76266542e8dd6010a2838b1937