Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eafe8bec20f618d…

MALICIOUS

PDF

94.7 KB Created: 2021-05-28 22:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8a9b2a095d88ad9a2f5fef429013433e SHA-1: 11bfc49c22b4ce8827a356113ae6f37387479c88 SHA-256: 1eafe8bec20f618da399dca25fb881334ab44e89324d054c95bf13d7d869448b
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 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/strik?utm_term=direct+and+indirect+speech+worksheets+with+answers+pdf+class+6 PDF link annotation
    • https://munuradon.weebly.com/uploads/1/3/1/8/131859370/8608608.pdfIn PDF document text
    • https://vunojomilubokub.weebly.com/uploads/1/3/0/7/130775688/remiwoxanuvuxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490252/normal_601c8943eccf2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392472/normal_5fde9a8fd2633.pdfIn PDF document text
    • https://vopukuno.weebly.com/uploads/1/3/1/3/131383764/d381f58803.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421058/normal_5fdf6200952be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417045/normal_60406cf3b7eaf.pdfIn PDF document text
    • https://nagipabusodeza.weebly.com/uploads/1/3/1/4/131453106/puzeramitusefi-xewazigezo-xofefowaziselu.pdfIn PDF document text
    • https://welukixavise.weebly.com/uploads/1/3/1/0/131069839/db225e19b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450890/normal_60607fbf26367.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417129/normal_5feba23d80be8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469353/normal_5ff8bb7b6d95b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495059/normal_60360d467e0f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408186/normal_602fce9f42337.pdfIn PDF document text
    • https://fuwefojogimoro.weebly.com/uploads/1/3/4/3/134339806/natewepofudisolu.pdfIn PDF document text
    • https://guvatezip.weebly.com/uploads/1/3/0/7/130776756/a6dd388ddf6af.pdfIn PDF document text
    • https://nobigifawu.weebly.com/uploads/1/3/4/3/134310244/5071408.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/800952a1-d93f-4063-84ae-ba7961a27509/nys_court_officer_exam_2014.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/799329e0-5914-47ef-b10e-bc25669fa7b2/is_1_police_plaza_open.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66042223-001c-4e55-a80e-4b31fbed082c/sipizowumutilotibawuvazax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e888b277-3f12-4173-91c7-d8b31c20e4f7/nijufusemotilutumux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bead6835-32eb-414f-b5d9-20c869bbc2ed/lijarak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da0119a6-b0a2-45c3-9a7f-bce8523eaae7/mefemilurivanavemug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b0f66df-14dd-495d-b9fb-a0f5b036b75a/dutixule.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_off00012d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D35 5552 bytes
SHA-256: a49bf4624392468f4b32833bd93379e1e5833cb26421bdf951092081ba607185
font_01_sfnt_off00014032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14032 13696 bytes
SHA-256: 5fd2bd5f7a1d914606fc79e8a840fe3e9b949e02525d8fd7917bb6e1bf9013cf