Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b6a90135550477b…

MALICIOUS

PDF

79.7 KB Created: 2021-04-24 18:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e52fae34f685c2349adb2f583230e26 SHA-1: 2dc0494e2ed786f75cd0e2a4627767ee5381cde9 SHA-256: 2b6a90135550477bd42136c38421f586af3a440fbe06aff77d1bab9f9f6d3aec
156 Risk Score

Malware Insights

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

The PDF contains a heuristic indicating a link farm, with one primary external URI pointing to a suspicious domain. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or a scam. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/strik?utm_term=tough+trx+workouts
    • http://pokinusuvato.getenjoyment.net/acknowledgement_in_research_paper.pdf
    • https://static.s123-cdn-static.com/uploads/4459058/normal_5ff69ef49fb05.pdf
    • http://nosumiva.mywebcommunity.org/7811076482.pdf
    • http://pamatidela.getenjoyment.net/andragogy_principles.pdf
    • https://cdn-cms.f-static.net/uploads/4448341/normal_6033b43815139.pdf
    • https://somotudodij.weebly.com/uploads/1/3/4/6/134699902/baziv.pdf
    • https://cdn-cms.f-static.net/uploads/4451231/normal_5fd611b97c86d.pdf
    • https://pufujodixig.weebly.com/uploads/1/3/1/4/131438007/miligodelutokiwamesu.pdf
    • https://pidoruna.weebly.com/uploads/1/3/5/9/135966994/zaduxoropoxurem.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_ca4cec38f9514f638ecbacf64a201f0f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/37b8c332-290a-490a-bb93-41b6e55eb2ef/siduzunoto.pdf
    • https://uploads.strikinglycdn.com/files/0298466a-4cc6-42be-8599-4d5d2fee6dc0/wivuwudefifafiwineburum.pdf
    • https://uploads.strikinglycdn.com/files/ad7b977d-2c46-479b-8f1e-db5ea95c23eb/avid_artist_mix_euphonix_mc_mix_faceplate.pdf
    • https://uploads.strikinglycdn.com/files/60fac93e-4bbc-4d49-a024-3c6c4f042c84/excel_sum_function_not_working_properly.pdf
    • https://uploads.strikinglycdn.com/files/6a1166d8-00e4-40aa-b64f-2c1b5e1d0ce0/kogebupib.pdf
    • https://uploads.strikinglycdn.com/files/497c0c41-85d1-4043-8178-664989b8441b/multivariate_analysis_regression_tree.pdf
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_b2e9acfd2da341478b5b33eb3eaaf9f6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/28d573dc-189b-486f-a182-454ab4d2c169/comentario_biblico_de_lucas_john_macarthur.pdf
    • http://gozidonozali.myartsonline.com/sabumogotizamuwep.pdf
    • https://uploads.strikinglycdn.com/files/72fb2c6d-0136-48f3-9cdb-00af00b848ed/what_to_do_when_someone_snitches_on_you.pdf
    • https://4c8e72c6-e2e3-4108-adc6-102de481692d.filesusr.com/ugd/f4b4ca_57e9a1f132134da79405587e98c95120.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc43.bin
24474e88d1cd158c7cf077e3734043e132cda4e0ccaeff79af8507c48b1306e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC43 4876 bytes
font_01_sfnt_off00010cf5.bin
0de49bb51711504e717a1a8a7909c216a83d4a4c9ae4eb7040165542ab46a913		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF5 10876 bytes

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