Malicious PDF — malware analysis report

Static analysis result for SHA-256 767244ec7adefd6b…

MALICIOUS

PDF

96.0 KB Created: 2021-05-29 08:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6502480b426d06d77fc35d5ee389f4b SHA-1: ddb59b10f84f18bb7d571ab1f8e379e2751d7174 SHA-256: 767244ec7adefd6be5e3484d6a4b7514def6f6cece339319a1c6df21987863df
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or spamming operation. The ML classifier and ClamAV also flagged the file as malicious. The embedded URL `https://jumiwimov.ru/123?utm_term=define+research+report+in+research+methodology` is likely part of this campaign. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=define+research+report+in+research+methodology
    • https://cdn-cms.f-static.net/uploads/4393370/normal_600bcacb89fe1.pdf
    • https://dubuzosokiboxof.weebly.com/uploads/1/3/1/1/131163723/2318328.pdf
    • https://modizotu.weebly.com/uploads/1/3/2/7/132740501/tazidanibu.pdf
    • https://cdn-cms.f-static.net/uploads/4489257/normal_600e7a4b003d0.pdf
    • https://cdn-cms.f-static.net/uploads/4445115/normal_5fd22cd8a91c5.pdf
    • https://bejetatibuket.weebly.com/uploads/1/3/5/9/135957672/816051.pdf
    • https://cdn-cms.f-static.net/uploads/4388839/normal_60123e6e7b9ed.pdf
    • https://cdn-cms.f-static.net/uploads/4393349/normal_6045d73d4f1d6.pdf
    • https://cdn-cms.f-static.net/uploads/4379029/normal_5fe745e8c2f4b.pdf
    • https://cdn-cms.f-static.net/uploads/4389101/normal_600ace2ec7b4c.pdf
    • https://cdn-cms.f-static.net/uploads/4410217/normal_60198065ae070.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/88fa9a4b-4ad7-41e8-a487-04e2bd3ed16a/what_is_a_proofreading_business.pdf
    • https://uploads.strikinglycdn.com/files/32b381ec-0206-491c-b723-6675f1d84098/bryant_350mav_parts_manual.pdf
    • https://uploads.strikinglycdn.com/files/93d189bc-0a0f-4675-8c60-9425b69e213e/what_transducer_is_on_the_minn_kota_terrova_80.pdf
    • https://uploads.strikinglycdn.com/files/cc5697e8-3a42-40cc-92a0-05b34a7a08b7/dance_music_90s_classics.pdf
    • https://uploads.strikinglycdn.com/files/74b89054-14a9-4603-a5ef-e0f18107520d/negezujojiwurofobim.pdf
    • https://uploads.strikinglycdn.com/files/b169bf9a-2e82-4270-8e23-f6511034808a/64732853222.pdf
    • https://uploads.strikinglycdn.com/files/e0dccf9f-1b2a-403a-9abd-ec7c5fb99fa5/soundlogic_xt_bluetooth_shower_speaker.pdf
    • https://uploads.strikinglycdn.com/files/f44d5622-b095-4fb1-971e-f8a97a84cbd2/how_many_carbs_in_boy_scout_popcorn.pdf
    • https://uploads.strikinglycdn.com/files/3e71f8a2-a052-4032-a0b2-19e276b0168b/tableau_for_dummies_download.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_off000139d4.bin
0f6db42363db82d3cbc49f88a8efa063f5cee7d2c1de073c0a169df508e803c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x139D4 5672 bytes
font_01_sfnt_off00014d0c.bin
ba868152bf5aef69605b275de6509a7aeb7f697ecdd0e2e50fa9552489733d96
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D0C 11072 bytes