Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1e17df74fcf201c…

MALICIOUS

PDF

83.1 KB Created: 2021-04-10 02:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33cc774bc5bd6c8093c6d28037c9b812 SHA-1: c5c08ae979c82badd2910ddc55260583991ec15b SHA-256: f1e17df74fcf201c3e369a348b5b5e6642e7464407bc880ebdb3104cdc6da78d
156 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 link farm, with the primary malicious URL being https://bologen.ru/strik. This suggests the document is designed to redirect users to potentially harmful websites, possibly for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://bologen.ru/strik?utm_term=how+does+rent+work+in+monopoly+deal
    • https://rokotejipap.weebly.com/uploads/1/3/0/8/130814190/gowivasowumev_nowagejomi.pdf
    • https://vazagivire.weebly.com/uploads/1/3/4/8/134874695/3fccf553348fec5.pdf
    • http://my-favshopg.online/8948041587087ygc.pdf
    • http://form-lnstagramverifiedbadges.com/nibapipikosyi3ul.pdf
    • https://lonunirixug.weebly.com/uploads/1/3/2/7/132710494/rumilasajeli.pdf
    • https://mesirurot.weebly.com/uploads/1/3/4/7/134706751/weduxopajevixuwiv.pdf
    • http://fc-aromat.ru/79558352886ari.pdf
    • https://cdn.sqhk.co/kurotevu/dymgeG1/gutomiwoz.pdf
    • https://cdn.sqhk.co/dajebala/QAxjd2E/piravalo.pdf
    • https://xonaxogurevof.weebly.com/uploads/1/3/1/4/131453171/558da3fcc2397.pdf
    • https://ganipomadajo.weebly.com/uploads/1/3/2/6/132695424/xazeropo-riroxo-rosol.pdf
    • http://soinjaga.ru/255596257643sx0p.pdf
    • https://vufobuvi.weebly.com/uploads/1/3/1/1/131163959/8615369.pdf
    • http://trafikcezaodebayisi.com/what_wifi_extenders_work_with_fiosf7vw2.pdf
    • https://gewefasawetuje.weebly.com/uploads/1/3/5/3/135315234/e53ccf.pdf
    • https://lasapiboxemifol.weebly.com/uploads/1/3/4/8/134865682/00d8f7582.pdf
    • https://wosubazaroden.weebly.com/uploads/1/3/0/8/130813518/mobapoxibedem.pdf
    • https://cdn.sqhk.co/pajubopolak/ibz0MRo/75671248468.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4fe49ba1-b038-49af-9689-cecf635e253d/revevunew.pdf
    • https://uploads.strikinglycdn.com/files/a853da35-bd9f-4347-b8c4-b2bf1e50a57c/39044576189.pdf
    • https://uploads.strikinglycdn.com/files/615f04ba-d394-476f-adc8-b17779ed4fa5/fesareresive.pdf
    • https://uploads.strikinglycdn.com/files/5a31a0bc-85c9-4e4a-b8d6-2e047de191cc/57266496933.pdf
    • https://uploads.strikinglycdn.com/files/2460724d-675e-4dae-baa9-978ba5c11d41/why_are_the_lights_on_my_samsung_dishwasher_flashing.pdf
    • https://uploads.strikinglycdn.com/files/9df62837-645d-4e57-b9e9-c70a2c540051/hp_laserjet_p3015_service_kit.pdf
    • https://uploads.strikinglycdn.com/files/9494514a-910c-4116-b7bc-05784caccd31/the_adventures_of_augie_march_quotes.pdf
    • https://uploads.strikinglycdn.com/files/ce97ba46-83a5-4ee1-8407-c95b887058a2/as_habl_zaratustra_friedrich_nietzsche.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_off000106af.bin
59264098cd25ac9216ecfe46f7fa5d4f73ee144d0eb7443ad507a058a901b62f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106AF 5324 bytes
font_01_sfnt_off000118c8.bin
88b09f3dc8f7f8e9ea48758228b19811a181bf674fa588f1c3c5e91ec4941dde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118C8 11056 bytes

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