Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a0d018a613de3fb…

MALICIOUS

PDF

78.6 KB Created: 2021-03-09 13:44:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 5cdd5eb8a764e46f54263c36f85860e2 SHA-1: 9f446cebac74068d53090020609dbb72c1ca522d SHA-256: 1a0d018a613de3fb03951557a3ad702b1b2633eabc260e4b21fe2b4d53b19f24
126 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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://xajibur.ru/strik?utm_term=circle+geometry+problems+and+solutions+pdf PDF link annotation
    • http://betmoy57.com/vumetilelitiwibox5cn0w.pdfIn PDF document text
    • http://kuvenumine.mygamesonline.org/what_is_an_engineering_notebook.pdfIn PDF document text
    • http://vpntop.info/u8_smartwatch_app_storeofk3d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490140/normal_6002ba2021dbb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482870/normal_5fe4c685c1b20.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369162/normal_5fc969dd78b81.pdfIn PDF document text
    • http://nepoxiduvilej.scienceontheweb.net/endocrine_society_guidelines_acromegaly.pdfIn PDF document text
    • http://edapog.online/family_feud_game_template_free2zs5d.pdfIn PDF document text
    • http://lenuvivureropi.scienceontheweb.net/vavabojate.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409826/normal_601b2804553e7.pdfIn PDF document text
    • http://fruit-italy.space/72515115862jpm16.pdfIn PDF document text
    • http://circulyarkadigital.xyz/tididoxunebwbwjb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491433/normal_6030192d1ee4b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5e446c31-fcb6-4427-a178-91ee45bbff8b.filesusr.com/ugd/4e76b8_f82d40ed062d4a2ab8476381647d65e9.pdf?index=trueIn PDF document text
    • http://dapufojutujat.atwebpages.com/85931643471.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/activity-_based_costing_and_management_project.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/4270740011.pdfIn PDF document text
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_29e2a09e48da4f92ae622fd89261d021.pdf?index=trueIn PDF document text
    • https://22520ec4-2132-45a5-98b8-54db1b71d3ea.filesusr.com/ugd/b33b96_905b6f6a789041f2a53f68701b9a82bd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fadedosi/15482323673.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/14645038322.pdfIn PDF document text
    • https://7605d98d-8b17-4a41-9383-f5c8d5af9bcc.filesusr.com/ugd/2bed4c_a3233138937046cfb3ca7acf2ab9e397.pdf?index=trueIn PDF document text
    • https://21319658-e817-4d6a-846f-872ccfe0f0c2.filesusr.com/ugd/982af2_9db37c1b22b64143a98e2ac2a5ccdd55.pdf?index=trueIn 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_off0000f0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EF 5620 bytes
SHA-256: f6ca0be109a0906eb9606715f1b620b31e1d148b821f40a11903aaa8bddfd5f6
font_01_sfnt_off000103f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F6 12036 bytes
SHA-256: 5ea408816a4ce6a36a6c096626def3992d7742803d431d703494f5b4ead9c2d8

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