Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb7020aa397579f…

MALICIOUS

PDF

76.9 KB Created: 2021-04-14 19:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31d88f192c6f9605e061e6c8488287d0 SHA-1: eac0577030c855019319139caed297289d5d9b28 SHA-256: 4eb7020aa397579f1532d9ba87c37f8305dd99d05ef90a90767ae156e0479325
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the embedded URIs points to 'botokaw.ru', which is suspicious. The document body is heavily obfuscated and appears to be generated content, further supporting the link farm and SEO manipulation attack pattern. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://botokaw.ru/strik?utm_term=how+to+make+your+own+advent+wreath
    • https://static.s123-cdn-static.com/uploads/4459175/normal_60001657cda30.pdf
    • http://mugowewu.22web.org/44480770715.pdf
    • https://static.s123-cdn-static.com/uploads/4370299/normal_5ff2bbfa11212.pdf
    • http://madamewezakab.iblogger.org/angular_momentum_in_quantum_physics.pdf
    • https://static.s123-cdn-static.com/uploads/4447658/normal_5fe5b04326a20.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a22a313b-68d0-4ae0-b01e-177768f32bd6/samsung_bn64_tv_price.pdf
    • https://ec560393-4650-4708-bf0c-d08fceb8458c.filesusr.com/ugd/ca69db_3d06222fef514d85ae22a391995d0e0a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/51f98f16-12d6-40bb-91c1-8ea5f707e562/is_it_rude_to_return_a_gift.pdf
    • https://6997f972-013f-4c6f-ac95-4179ba17a557.filesusr.com/ugd/549e1a_52efe7d503af421ba52a27560185ad78.pdf?index=true
    • https://uploads.strikinglycdn.com/files/01c97cac-114e-4748-b0ed-7ccfdb4393b6/shadowrun_weapons_genesis.pdf
    • https://uploads.strikinglycdn.com/files/4f4f4190-5c96-44f7-93ca-42e14d5e5f49/rosejokigizixaxufure.pdf
    • https://6776ac3f-883f-499f-bc52-38dff818ec46.filesusr.com/ugd/969751_73f885bd8f1841b8adc8faa476f28fba.pdf?index=true
    • https://uploads.strikinglycdn.com/files/639da025-3580-4fc9-baf2-cc6894815307/sig_p229_e29r-9-bss.pdf
    • https://s3.amazonaws.com/lomogas/23261244849.pdf
    • http://retugizi.rf.gd/sebopupirafitoliki.pdf
    • https://0fc0baf9-b884-4fcd-968e-f93c0f938930.filesusr.com/ugd/68ec51_1f468852e2ad410abcf3179d1608c783.pdf?index=true
    • https://b6f97e74-198a-461d-a312-d71b9712332b.filesusr.com/ugd/a2d007_ff7a212226894aeba9432c98586ffb52.pdf?index=true
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_f989a3f61fea419db0e9b4b7df6aa0ca.pdf?index=true
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_e8daf824d5074b0c9b78b455623c342d.pdf?index=true
    • https://s3.amazonaws.com/divelatoxa/a_blood_type_diet_food_list.pdf
    • https://c3e810f9-371e-40b9-9a0b-4695a496ec77.filesusr.com/ugd/2c7c49_16d0a1696fe84182a44de4efef1d6c40.pdf?index=true
    • https://s3.amazonaws.com/mixanaz/33152781819.pdf
    • 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_off0000ef72.bin
9e0ed7cfd026a4effe220f306c7d83ef29ed31fe757da0ff0a6686b672155ee8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF72 5132 bytes
font_01_sfnt_off000100d1.bin
621ae7f5704b5bef5cb0b59f4abeb9789bdfd36e077dd437f46cd426f9cd373c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100D1 11004 bytes

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