Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b72f66b6c6f9937…

MALICIOUS

PDF

72.0 KB Created: 2021-04-11 04:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: bfc09af239301520f30aa9169837fb21 SHA-1: 5b6a227cb0b9487fc6cc087f09d56ed9e58b4fd3 SHA-256: 2b72f66b6c6f993723c4bfbb2df73d70fc79a1df8a1fd0cc8e61dc0eddd7a889
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent link pointing to 'baarspo.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a malicious intent to distribute further payloads or conduct phishing. The ML classifier and ClamAV detection strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/strik?utm_term=how+to+turn+on+viewsonic+projector PDF link annotation
    • http://topcreditscore.info/41554441143yph0t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462339/normal_6045093730321.pdfIn PDF document text
    • http://xatakafigudu.getenjoyment.net/what_books_are_the_witcher_series_based_on.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486523/normal_5fde4db07ed3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383698/normal_600c45a48cb68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443810/normal_602367af29c70.pdfIn PDF document text
    • http://fruct.space/sample_of_autobiography_about_myselfouygo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380674/normal_6035f9336e109.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392650/normal_605188f5b45b0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7d0b25c-3842-431b-a8f9-e8e4e5d0d156/jipivipebitunevosibiba.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/mutepenonorukukubujeben.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc592b06-2ed5-4a88-87a9-41fc2db3ecec/pagatigolet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b15823b-d69d-460d-a6ee-522b3615ee84/69162833864.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/kenmore_70_series_heavy_duty_washer_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e22f3467-8ba4-42e2-bf35-0dd551000c66/what_is_the_latest_technology_in_networking.pdfIn PDF document text
    • http://molagegivijoxu.onlinewebshop.net/76906654311.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/pebuwigugipufunov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d9724aa-6ac8-463a-86e4-c1ae97a8216e/fedex_home_delivery_bridgeport_wv.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/craftsman_leaf_blower_fuel_oil_mix.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF30 4872 bytes
SHA-256: 6bb7180c919895407908d3a8355245c4da6fea5916ef0f22bb1ab1b2be0f9d4c
font_01_sfnt_off0000efee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEE 10308 bytes
SHA-256: 7098266dd5b616fde42915d53a0c128b72e1cccb2b43654fa4d5de36ea07f71d

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