Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f0f3384bbe43893…

MALICIOUS

PDF

96.3 KB Created: 2021-05-14 18:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a1c4beb4592db7b36c91748cffafdd01 SHA-1: 9787cc691eeccb8247a6eda35381464b8d927a09 SHA-256: 0f0f3384bbe438930fbf7274c5c0f084e8582cf067f387e60ba25d78583ce5a3
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are SEO-optimized, suggesting an attempt to drive traffic to malicious websites. The presence of a critical heuristic for PDF_SEO_LINK_FARM and ClamAV detection indicates malicious intent. The primary malicious URL identified is vilenefex.ru, which is likely used to host or redirect to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://vilenefex.ru/strik?utm_term=lame+deer+seeker+of+visions+analysis PDF link annotation
    • http://carins.info/pupawavimegenerunenodima5qn0c.pdfIn PDF document text
    • https://diwolusetu.weebly.com/uploads/1/3/5/2/135299278/b10a9501.pdfIn PDF document text
    • http://instapodarok.site/graphic_designer_job_resumel6n7a.pdfIn PDF document text
    • https://sanuvexugivi.weebly.com/uploads/1/3/1/6/131606490/8285667.pdfIn PDF document text
    • http://larts.digital/the_endless_game_rotten_tomatoesn2pcq.pdfIn PDF document text
    • http://kiluniv.22web.org/ashab_bedir_isimleri.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/can_you_peg_a_flush_in_cribbage.pdfIn PDF document text
    • https://11e0ccb5-01dd-4757-ae93-f6f3b4f5ca32.filesusr.com/ugd/1a2ce6_15f9251a3a354de6919c246bea7ca319.pdf?index=trueIn PDF document text
    • http://lotarikavim.rf.gd/adams_calculus_free.pdfIn PDF document text
    • https://b634734f-67aa-4edc-9b69-dcf7610e4690.filesusr.com/ugd/c86859_ec322b34779f4ee0af155e51e56351a8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/sunase.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/baldor_solucionario.pdfIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/39036978312.pdfIn PDF document text
    • http://repaxonuti.epizy.com/how_to_open_my_treadmill.pdfIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_68b8fd1b2c2e467e85a23657bf7c54d9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/ccna_security_exam_sample_questions.pdfIn PDF document text
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_f8c487e5afe24d7f81bd3c18e509e01f.pdf?index=trueIn PDF document text
    • https://2f60c0de-bae8-48d8-8f3f-ce7907f87c52.filesusr.com/ugd/badafb_3b5afd7ce4cd4d62ba0696959d089bfe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/46846431229.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_off00013c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C49 5220 bytes
SHA-256: 91bd278c41fcf0840a708af7a78fe5202306dbbd0136dc7255a121fc5f643506
font_01_sfnt_off00014e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E09 11352 bytes
SHA-256: 22d1876b5058956e5b59ef8a20ddb523e6fb6f05eeaf5c75576c6cc7f7ccfba4

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