Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dfb17d8109c2aff…

MALICIOUS

PDF

80.5 KB Created: 2021-03-16 03:03:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 44148eb2512a1cbb78547cb3a7f2ad8e SHA-1: 1aa66fc1c3d0ba3aa09b74e3e5fbcca9c3cf8465 SHA-256: 3dfb17d8109c2aff69fedd147aab63d52842402db38c9b08399c8b4ca9e0ea50
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. It contains numerous external links, with a primary focus on directing users to 'mezovuduw.ru'. The document body, though heavily obfuscated, appears to be a lure related to 'app2sd apk mirror', suggesting a phishing or scam attempt to drive traffic to the malicious domain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://mezovuduw.ru/wix?keyword=app2sd+apk+mirror
    • https://cdn-cms.f-static.net/uploads/4393489/normal_5fd12c972bde2.pdf
    • https://cdn-cms.f-static.net/uploads/4469626/normal_5fda002e591c3.pdf
    • https://static.s123-cdn-static.com/uploads/4485010/normal_5ff23e66e1cc3.pdf
    • https://cdn-cms.f-static.net/uploads/4366325/normal_601518093543f.pdf
    • https://static.s123-cdn-static.com/uploads/4454694/normal_5feedc55bdde0.pdf
    • https://cdn-cms.f-static.net/uploads/4497109/normal_601a47d1a8cd4.pdf
    • https://cdn-cms.f-static.net/uploads/4450635/normal_6011e9afa46cc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gafedupeba/safety_data_sheets_for_asda_products.pdf
    • https://uploads.strikinglycdn.com/files/2cb94199-f932-4149-8034-1e71205468ad/19119032758.pdf
    • https://ced6af22-cf5f-4df0-9cd6-2d424634d287.filesusr.com/ugd/3eed2b_bbc87061676241aea24ad7c4cd67c4a8.pdf?index=true
    • https://s3.amazonaws.com/wekibik/aftermath_2017_movie.pdf
    • https://b89c0965-50b5-483f-b67e-52f573158f4f.filesusr.com/ugd/1e222e_ebe1387fae8e45d991e65bc1b2609ce1.pdf?index=true
    • https://5a2ada08-5b6c-402a-b0df-3636415b461e.filesusr.com/ugd/434ae6_0fa7f7b9c331411589fde990cedf2ab0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d4b67bad-206e-4384-a6d6-602caadb4653/citizen_eco_drive_radio_controlled_wr200.pdf
    • https://uploads.strikinglycdn.com/files/565aafa7-9ba4-42d3-ba95-dd13fda16549/palasafem.pdf
    • https://67dc9804-4028-4298-afd7-d431d2c16fe6.filesusr.com/ugd/559c84_a3124bdba9a84762b0f30066d315453b.pdf?index=true
    • https://336ddc11-c37d-4cd6-9685-7accad2975f7.filesusr.com/ugd/479fa9_87b2cd87c55d46ac81ec9c596a123b82.pdf?index=true
    • https://s3.amazonaws.com/xowasosuf/kebofuneset.pdf
    • https://s3.amazonaws.com/bamepofewalada/sfg2_mod_apk_unlimited_health.pdf
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_a9ba234a69dc4bc4bc85df6b60e77111.pdf?index=true
    • https://uploads.strikinglycdn.com/files/acbbef42-9d4f-46fd-99cc-a7f468aeb36c/44783645513.pdf
    • https://9fb0fece-6c2a-4f8b-8ff1-5d9ea67f5ee7.filesusr.com/ugd/f6a907_4502d720a72d45abb7e6cc726380a9e4.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
    • 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_off0000e7bd.bin
8f4d997756c32bb79936153af899698f989a450a2287d2a74e2a3dc5e4c646e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BD 5260 bytes
font_01_sfnt_off0000f98b.bin
93c4a14c3572c7bdb66f2714e01acb6463d682e9fc5a73808ad8244a3c2fa066		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF98B 11048 bytes
font_02_sfnt_off00011f99.bin
9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F99 16092 bytes

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