Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae0f9ded35d7207…

MALICIOUS

PDF

82.9 KB Created: 2021-05-31 07:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b5fa67bb1e5a9d934ede9f3beb568769 SHA-1: 75cbacbc595cd441343adfbcdc2388cd1e209994 SHA-256: 8ae0f9ded35d720753246cfe4b35e916e167ec9839a11801062c04d4619df018
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://mezovuduw.ru/strik?utm_term=c%25C3%25A1ch+hack+fifa+mobile+2019 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490121/normal_6031879573419.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452157/normal_60487331786a6.pdfIn PDF document text
    • https://kuvakikarubefi.weebly.com/uploads/1/3/1/3/131383404/rakazu.pdfIn PDF document text
    • https://voduzivet.weebly.com/uploads/1/3/1/6/131607522/6174253.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480383/normal_5fecbb936d24b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454684/normal_603638945d06d.pdfIn PDF document text
    • https://rakositove.weebly.com/uploads/1/3/4/5/134595637/gonobesoradon_duxaruxopupuvo_lizefemijelox_rodijusawuwi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379236/normal_5ff228127212a.pdfIn PDF document text
    • https://mezovojexojija.weebly.com/uploads/1/3/0/8/130874002/496128bd06.pdfIn PDF document text
    • https://siputewebototab.weebly.com/uploads/1/3/4/4/134480832/sepetegobamakapulu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443354/normal_6065defb71b00.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374847/normal_5feb7ce361661.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457000/normal_5fd10d5bd031d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/c025c0a4-0fbd-472d-9236-99d81bae3825/45248534397.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f1f80b6-0f30-4577-a684-695cbc86a6d2/statistical_learning_psychology_language.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34c68894-8226-4c15-9b16-beec0febbce7/13833988992.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f027155a-3f0b-4007-8bbe-4ec2d612964b/xozekupapikilunu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11a57a60-fbde-4114-a82d-b0c74d1225c1/best_stock_broker_in_india_for_long_term_investment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c94e1bd2-f3e9-45ef-9975-f2e17c3fd41b/52317881922.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b124ad9-78a0-4abc-9b2f-49e064231c1d/tuesdays_with_morrie_sparknotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92af0e4e-3489-40c6-aac2-812e085602dc/how_accurate_is_cvs_advanced_glucose_meter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc108489-6b65-42b2-b423-b6e79c83a9b4/puremoteremamagenove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81e6c28a-986b-49fd-9a2a-2cb055cf3ef0/moot_court_problems_and_solutions_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95d1a248-ae10-4cde-83c2-9d4b5442dcde/apush_exam_2021_study_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFB 5392 bytes
SHA-256: 6fb934117d01da2d27024057fdd0d85c76c61ac749c3b433d9069019244895a0
font_01_sfnt_off0000fcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD4 20720 bytes
SHA-256: 054aac035eb29cf42ccb855d9c10793962b4fcf0f3ecff4bf06ee904c6c66ec8
font_02_sfnt_off00012e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E02 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c