Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a48b5e58f41b561…

MALICIOUS

PDF

83.8 KB Created: 2021-06-03 00:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bb6fc6535ae309b67ce1116590e49dd SHA-1: ddbbd5f28ead6b98826ad9c2176f33d277de2c1f SHA-256: 2a48b5e58f41b5614b1d8d7d67c69d086e067494a4677314abae7e56ae1a716b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to 'crewmak.ru'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link-farming or redirection scheme. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crewmak.ru/pbw?utm_term=exercices+sur+les+pronoms+personnels+compl%25C3%25A9ments+pdf
    • https://fipogelijemebu.weebly.com/uploads/1/3/1/3/131398193/6efa1a.pdf
    • https://sidujojuwizubal.weebly.com/uploads/1/3/4/5/134587716/3168cf73a.pdf
    • https://gifoxulexup.weebly.com/uploads/1/3/4/8/134865115/edcb43ef1aea.pdf
    • https://wopufibirebosaw.weebly.com/uploads/1/3/4/4/134466277/5081298.pdf
    • https://mivetemadika.weebly.com/uploads/1/3/4/4/134471856/xojoguva.pdf
    • https://vomuzubedabop.weebly.com/uploads/1/3/0/9/130969103/gozereve.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9dfe7d03-fc5c-4c32-b57e-492fff35b34c/option_trading_strategies_for_beginners.pdf
    • https://uploads.strikinglycdn.com/files/f0ddb3bf-e487-4240-9d26-1e2d1b132de7/jiwikuxukomu.pdf
    • http://wuranosa.pbworks.com/f/mivugejipapudodoxuvo.pdf
    • http://paderukut.pbworks.com/f/zarulunuxiburarif.pdf
    • https://uploads.strikinglycdn.com/files/9a882bd4-c119-4956-8565-9a73aea4203c/dajatuvoxe.pdf
    • https://uploads.strikinglycdn.com/files/774d6422-769b-4513-82c8-13cc98f1ffa1/glock_19_gen_4_long_trigger_housing_pin.pdf
    • http://biwonuv.pbworks.com/w/file/fetch/144473403/slendytubbies_2d_download_pc.pdf
    • https://uploads.strikinglycdn.com/files/806a326f-e35b-49ea-a738-b6290c39c851/caballo_de_troya_8_jordan_gratis.pdf
    • http://pimepovume.pbworks.com/f/gta_5_apk_data_android_offline.pdf
    • https://uploads.strikinglycdn.com/files/a73a884b-30b5-4d1f-8fba-002624e5b688/hitchhikers_guide_to_the_galaxy_quotes_42.pdf
    • https://uploads.strikinglycdn.com/files/9f399633-4b87-4161-9de3-2527b303d6ed/vetakeparakusadomotajefox.pdf
    • https://uploads.strikinglycdn.com/files/b602e9ff-23a6-4042-a091-2330de78a1b3/gemunoxajegudegodowa.pdf
    • https://uploads.strikinglycdn.com/files/bcfc2597-5814-4fe1-88b1-6008e7f78a8b/kijabirefuledivevebuzara.pdf
    • https://uploads.strikinglycdn.com/files/e03b29e7-c3c4-4b4a-967c-dfe055bd704a/how_many_sweet_potatoes_is_5_lbs.pdf
    • http://didaneguk.pbworks.com/f/how_to_do_half_life_problems_math.pdf
    • https://uploads.strikinglycdn.com/files/9f73d20b-2e6a-44b0-81e3-6cf024db0333/how_to_install_vtech_cordless_phone.pdf
    • https://uploads.strikinglycdn.com/files/2db31477-7b62-4638-a353-abd7e508c7a6/zaxapupafiwomefaj.pdf
    • https://uploads.strikinglycdn.com/files/12348016-5694-4efb-906f-30ddf98fbfbe/noxuretajilinolubisewim.pdf
    • https://uploads.strikinglycdn.com/files/81193ebf-9b7a-4e40-a945-ac45526d9c7e/can_you_do_hotspot_with_unlimited_data.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_off000104ca.bin
940e1faa1bb0607e5e7cffe098133e4fa7210bd51490b606509699364c730596		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104CA 5260 bytes
font_01_sfnt_off0001165e.bin
fa2a7a71a270880ea7e6f5b0107048b5d0a907c4215b21c642d7f8b3532d956b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1165E 12616 bytes

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