Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d5f8478a57be5dc…

MALICIOUS

PDF

79.6 KB Created: 2021-03-28 12:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2d9ae6929a2cfa870cca51bdc9d75f9d SHA-1: a93d93c66c01a4d9174018f4d29c94d148dfc5aa SHA-256: 8d5f8478a57be5dc247c7470903d049ee2f4c6c071255e96c9ebc74bd956ca2e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to 'w4 personal allowance worksheet', aiming to trick users into clicking malicious links.

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://botokaw.ru/123?utm_term=w4+personal+allowance+worksheet+d PDF link annotation
    • https://cdn.sqhk.co/sunalikefazo/lZia1ie/42201722869.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486535/normal_6049de35c9939.pdfIn PDF document text
    • http://ledy66.net/zibesabujex86q36.pdfIn PDF document text
    • https://lisufijefe.weebly.com/uploads/1/3/2/7/132740260/japopezajowixum_xelavi.pdfIn PDF document text
    • http://virnet77.ru/pexamumarazagikus2kh7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371787/normal_60030a6e61118.pdfIn PDF document text
    • https://cdn.sqhk.co/bisegepamitu/h4oEagU/gateway_b1_test_answers_unit_3.pdfIn PDF document text
    • http://triple-doska1.club/ramofhcwn6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388274/normal_604a66b2c0957.pdfIn PDF document text
    • https://woteginawewe.weebly.com/uploads/1/3/1/3/131379999/2e03d22e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491436/normal_600a770327f34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411702/normal_602db20b04636.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455183/normal_5fff14358f1b6.pdfIn PDF document text
    • https://cdn.sqhk.co/rirelolut/q9hgcjg/modefupawova.pdfIn PDF document text
    • https://sigogaxeba.weebly.com/uploads/1/3/4/6/134620414/tujaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486368/normal_5fe125b44aaed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444104/normal_601ccd1b4d09f.pdfIn PDF document text
    • https://cdn.sqhk.co/wenegifuteg/3vicd3V/smart_card_reader.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nigimul/brahma_kumaris_hd_images.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/boxing_star_mod_apk_unlimited_money_revdl.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_off0000f76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76E 5416 bytes
SHA-256: 38722972cc2d7a54b4087a8fc3188d09c52fc7b0c0ddd19750ae2552228cceb0
font_01_sfnt_off000109f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F1 11056 bytes
SHA-256: 8b2caddb6cdab1072b63313dfbf39e8b3522eafd4c05c9016174dd4a52a62758

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