Malicious PDF — malware analysis report

Static analysis result for SHA-256 811b2a6d9fcd314b…

MALICIOUS

PDF

90.3 KB Created: 2021-03-12 02:09:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bed7e8aa18a500caed76f246db1e25e8 SHA-1: eda8eada27544555b31968a7c9874761e61e5d38 SHA-256: 811b2a6d9fcd314bc09f69055ebf2ad84f4e634489c8ac637b78d8cea07bfba3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a PDF link farm. One of the primary external URIs, 'https://nipisod.ru/award?keyword=moment+of+inertia+formula+pdf', is suspicious and likely leads to a phishing or malware distribution site. ClamAV also detected this file as 'Pdf.Phishing.Trojan', further supporting its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/award?keyword=moment+of+inertia+formula+pdf
    • https://static.s123-cdn-static.com/uploads/4467564/normal_5fca5ed03015b.pdf
    • https://cdn-cms.f-static.net/uploads/4450417/normal_602688595d8f6.pdf
    • https://static.s123-cdn-static.com/uploads/4402717/normal_5ff775d68e82d.pdf
    • https://cdn-cms.f-static.net/uploads/4427529/normal_601704d90eca6.pdf
    • https://cdn.sqhk.co/rubogomuweme/hgEgjge/best_gamepad_for_pubg_mobile_ios.pdf
    • https://cdn.sqhk.co/putizimetiwe/ViaOFid/free_3d_wallpaper_for_android_phone.pdf
    • https://static.s123-cdn-static.com/uploads/4409258/normal_5fee4f1d30f95.pdf
    • https://cdn.sqhk.co/lofesaxudiwo/ijUtgcn/62934599169.pdf
    • https://static.s123-cdn-static.com/uploads/4384634/normal_5fe4e8a9c4d63.pdf
    • https://cdn-cms.f-static.net/uploads/4366956/normal_6010434da5158.pdf
    • https://static.s123-cdn-static.com/uploads/4455197/normal_5ff15f0268ae8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/84b269e5-6f69-4957-bbb1-7f7a5892c99e/kitchenaid_mixer_replacement_grease.pdf
    • https://uploads.strikinglycdn.com/files/e78f8d64-7c7d-49fa-9e62-0525100b75ff/8574139084.pdf
    • https://c2267750-1f6d-4c2f-944a-eb302c7f07d7.filesusr.com/ugd/93971e_6caa69323d7f4c48b7dedee8bdd71379.pdf?index=true
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_bd6596dbb73c48e08e177b6a0863e4a2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9b587be9-7e0d-4b02-aca2-f95f4073e40a/95634690756.pdf
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_73ba2f6438fd450eb8138d35f14e2bf6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/73756d24-d734-4abf-ac18-6248ecaaa867/sportster_service_checklist.pdf
    • https://uploads.strikinglycdn.com/files/8c8fd12b-53b4-4ff5-803d-35ce03c61072/3924357064.pdf
    • https://5e1449e8-5ae4-4a15-bc7a-ee23795bc964.filesusr.com/ugd/3a34a5_db60921977724a2bb22db889d2c77d26.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5e8868e0-5e41-4f24-834b-ea912cfbedcc/what_are_the_complications_after_miscarriage.pdf
    • https://uploads.strikinglycdn.com/files/4f8eb538-8dd9-416f-9f7e-4d2ab2d309eb/43875148400.pdf
    • https://uploads.strikinglycdn.com/files/8711881f-eb2c-4986-9861-3f0372d4b3ed/40394826242.pdf
    • https://uploads.strikinglycdn.com/files/d631bf6f-35dd-42a3-88a5-afee24dedb5f/how_to_use_a_shark_euro_pro_x_sewing_machine.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100a6.bin
a00fd62dfe77d9e1c8ff33b9c0027e4b27da9c716e2f2a0d30d6bfeb0717609a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100A6 5012 bytes
font_01_sfnt_off000111a5.bin
f9d89685dd5099ce8523cbdf591bca577640619c1061c41a18e4d1492b9bb684		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111A5 16828 bytes
font_02_sfnt_off000146d1.bin
2d958bd008b8db5b33092f112e99c856adbcc0a100e950d14ff814b784be6357		 pdf-font-stream PDF embedded font (sfnt) at offset 0x146D1 16060 bytes

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