Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf22794a7d58c056…

MALICIOUS

PDF

92.7 KB Created: 2021-03-31 20:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a4004b4940fb093d89b42ff06bf3d97 SHA-1: 18c7b3317264705a4f86e340705ecfdbe34c865e SHA-256: cf22794a7d58c056b7a21d34e4a137f3c2b62b9de8026ff4369f8ce558fc45a4
164 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, indicating malicious intent. It employs a link farm technique by embedding numerous external links, likely to distribute malware or phish for credentials. The presence of external URIs and the PDF_SEO_LINK_FARM heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://baarspo.ru/award?keyword=cengel+termodinamica+e+trasmissione+del+calore+pdf+download
    • https://remurefovedelag.weebly.com/uploads/1/3/1/8/131860204/bb6f7cd0140089d.pdf
    • http://rijupoxog.22web.org/mijuputinofosofu.pdf
    • https://pufetebad.weebly.com/uploads/1/3/4/7/134711346/2845837.pdf
    • https://fuvepuzineg.weebly.com/uploads/1/3/4/4/134463404/selutupil.pdf
    • http://dulexip.22web.org/fedex_expanded_service_international_air_waybill.pdf
    • https://jokinurelebuvet.weebly.com/uploads/1/3/1/8/131856462/6284198.pdf
    • https://wejigewaja.weebly.com/uploads/1/3/5/4/135400860/kedifule-pewiwajinedona.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gakifok.rf.gd/common_russian_phrases.pdf
    • https://uploads.strikinglycdn.com/files/185c4be2-3d0f-47ec-9867-22f7b25a3c00/xenujuw.pdf
    • http://girafarurogu.rf.gd/dovekoxesola.pdf
    • https://uploads.strikinglycdn.com/files/601b396b-9507-445c-a9ee-7841d857d5b6/how_to_wrap_gifts_step_by_step.pdf
    • https://s3.amazonaws.com/tubupejevomo/59338744122.pdf
    • https://uploads.strikinglycdn.com/files/aa98e0da-cf0d-49a9-85ed-b2702604b15b/16939558451.pdf
    • https://s3.amazonaws.com/vapelurowar/jowatexuse.pdf
    • http://tezipibuboxigo.epizy.com/80539671452.pdf
    • https://s3.amazonaws.com/jowutoneranemuk/fetopir.pdf
    • https://s3.amazonaws.com/lixuzo/17390291607.pdf
    • http://veselawo.rf.gd/is_procreate_free_on_ipad_mini_4.pdf
    • https://s3.amazonaws.com/rotowan/cisco_ios_intrusion_prevention_system_deployment_guide.pdf
    • https://s3.amazonaws.com/punurum/81332919057.pdf
    • https://s3.amazonaws.com/tenunud/34045554598.pdf
    • https://uploads.strikinglycdn.com/files/e483e6c1-5344-49df-af31-d922656577c3/42899118934.pdf
    • http://gobavaduxa.epizy.com/84128590309.pdf
    • https://s3.amazonaws.com/vibasujefir/fojolifebomuge.pdf
    • http://mimenevav.epizy.com/2408052036.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000129e0.bin
fb1b1503e29c2260013e31c401f4065d7614f77efe70f1de3b7c8a87c0a05ef2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129E0 5472 bytes
font_01_sfnt_off00013c70.bin
b8fd4ce6bcb28573b6dd70567ddc201bfc671987e8831364240418a2ddb9e87b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C70 13648 bytes

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