Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea256d9b67a3554f…

MALICIOUS

PDF

71.7 KB Created: 2020-12-28 10:48:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8d414ea701ef837a20dbcae2c592ccc1 SHA-1: d0ad398bbb58eb75ded45bc41b68b162d885a559 SHA-256: ea256d9b67a3554f76ae56a34a1569a5c44e9788b79167381892b8c8882c2eb2
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and a link farm points towards initial access via spearphishing attachment, with the ultimate goal of exploiting the client to execute further payloads.

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://trafficel.ru/strik?utm_term=zombies+don%2527+t+drive PDF link annotation
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/rugefadap-jikep.pdfIn PDF document text
    • https://xameramavojipav.weebly.com/uploads/1/3/4/2/134265998/bojesu.pdfIn PDF document text
    • https://xuwuperozaposa.weebly.com/uploads/1/3/2/3/132303395/826152352fc16.pdfIn PDF document text
    • https://kawuloxegulul.weebly.com/uploads/1/3/4/3/134389306/4570535.pdfIn PDF document text
    • https://gekeforoka.weebly.com/uploads/1/3/1/4/131438206/darimerawus-jekizefivepasul-lumimivemage-kalekapaz.pdfIn PDF document text
    • https://cdn.sqhk.co/wefekoferu/Pibiehg/bibaxipoxinasosede.pdfIn PDF document text
    • https://saronikevuvu.weebly.com/uploads/1/3/4/4/134460573/3668212.pdfIn PDF document text
    • https://juzukixidud.weebly.com/uploads/1/3/4/4/134453884/jawapu.pdfIn PDF document text
    • https://cdn.sqhk.co/marixefe/ghhihGh/maplestory_dark_knight_mobbing.pdfIn PDF document text
    • https://supekekimut.weebly.com/uploads/1/3/4/8/134871395/konuxibenakuva.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/6a5f669c-695b-4f75-9718-38da254f35fb/35405933316.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8838b5fb-7af5-4623-8fff-dfa27a81bc80/homeadvisor_contractors_for_home_improvement_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cd66d6d-9dbb-4977-84fb-81fccb485a25/41186086540.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fae8c031-6488-4dbd-afba-7bc048065341/62978082195.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/557fddef-8a9a-4862-839e-541b908b07ff/harley_merlin_books_series.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5aa718f3-c6b4-4152-a631-821281b3a8a4/98889386895.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_off0000dde9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE9 4920 bytes
SHA-256: a2e352d7672acc74f57c34e67eae65a66261e63b99aaa7ad51aa49c28ce3e019
font_01_sfnt_off0000ee97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE97 10192 bytes
SHA-256: 39cedb918125f530c757b9affd332de025dbbdae0682fcf199c41fbabb1acec4

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