Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2d8f066e30c9aa6…

MALICIOUS

PDF

79.1 KB Created: 2021-03-04 14:43:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 74140863cc5789ddf26adaa51dd66909 SHA-1: df1535175c7b301fe26dd7b234154bcbfdf2a508 SHA-256: b2d8f066e30c9aa6514dec47fc0eb4ae3355275abe1def7d37081b5135c13b8f
226 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://botokaw.ru/123?utm_term=don+collier+net+worth+2018
    • http://3bureaureport.info/19951595185gs6qy.pdf
    • https://xilivixawigilu.weebly.com/uploads/1/3/4/6/134672458/286f6002486b71.pdf
    • http://about-central.com/center_parcs_sherwood_forest_mapq4co1.pdf
    • http://securitycheckingbrowservkcom.xyz/sat_reading_comprehension_passagessr992.pdf
    • https://ragajepegoxi.weebly.com/uploads/1/3/1/3/131379061/2ffc8d74.pdf
    • https://dukopovofozevi.weebly.com/uploads/1/3/5/2/135295758/wujinoraxadalomego.pdf
    • http://vash-fasad.live/taylor_scales_batteriesulqze.pdf
    • http://obschee.xyz/asuhan_keperawatan_gastroenteritis_akut2bwkg.pdf
    • https://gawujura.weebly.com/uploads/1/3/5/3/135325150/durug-bapiz-zuwepotakat.pdf
    • http://car-test.pro/residoxosajifamenixalejtvyf.pdf
    • https://milorupubi.weebly.com/uploads/1/3/4/3/134317418/kuxudejob-zajeruf-nubadegetefom.pdf
    • http://neojust.ru/34427528894ctm0j.pdf
    • http://jsexj.fun/94971069390me8op.pdf
    • http://optalpha.com/side_by_side_third_edition_book_3e7q5s.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a161ff94-1a6f-4367-b6f8-8e513a5e676d.filesusr.com/ugd/4c7633_c8a58d049d4145669bae200ed3e138b3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3c40f42b-0dde-4045-9ffd-3c9fe0ac56cc/mechanical_engineer_job_roles_and_responsibilities.pdf
    • https://2ac56fc1-f7ee-4366-9cb2-1681469c68ee.filesusr.com/ugd/b914b5_6c98ccbb06234c9297565103af80b590.pdf?index=true
    • https://uploads.strikinglycdn.com/files/338ba333-d0aa-4302-9e6e-45206c012d7f/dell_2407wfp_service_manual.pdf
    • https://9a89a7da-ede3-42eb-a537-7416be21eb2d.filesusr.com/ugd/aaaf79_835d615ece824b64a0fab3ef91f264a7.pdf?index=true
    • https://05b56818-8b0b-4484-a411-4f1234233f1c.filesusr.com/ugd/e49726_a1894b340c70473eb27e0d9dde4a01cc.pdf?index=true
    • https://35548484-ce42-4b18-9d9d-834326683263.filesusr.com/ugd/a221b6_3727475a9ad84426a0ea19bfb77cfbe4.pdf?index=true
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_5f4b48bb38004ce5ba1d12fa43bac53f.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8cc.bin
b3571ad09921a12be05e0603829d1813f10a6e3c01c675f774eef699b50e4fdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CC 5108 bytes
font_01_sfnt_off00010a49.bin
11376040ac1e39b277566017099fde413c3e55db630a629de33e5e79c69b878a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A49 10744 bytes

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