Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ecc4ecc503fa321…

MALICIOUS

PDF

76.2 KB Created: 2021-03-03 17:34:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 97517966e6806ca2f4e19bd3a554d09f SHA-1: ecf0253deb23b79282de64b6b341395b487010cb SHA-256: 3ecc4ecc503fa321db281a4bce3eb02799c4cabda7051b5132e37636bb2511fb
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous external URIs and is identified as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The presence of embedded URLs suggests the document is intended to redirect users to malicious sites.

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://midufefew.ru/123?utm_term=rabbit+holes+synonym PDF link annotation
    • http://mitutepoka.medianewsonline.com/2570366474.pdfIn PDF document text
    • https://jawizadobem.weebly.com/uploads/1/3/4/7/134773472/6cb25019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458394/normal_5fe809cb27647.pdfIn PDF document text
    • https://velumosatowe.weebly.com/uploads/1/3/4/8/134883763/a3d28c99a3ce3c.pdfIn PDF document text
    • http://myirn.icu/13567909390k07pw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482402/normal_60146f635ba52.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeforms.com/437730169521z6ze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463277/normal_602080e14433f.pdfIn PDF document text
    • https://pulapiselipatux.weebly.com/uploads/1/3/1/3/131378970/30d773f2d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529893/normal_601b3d978e3c7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422643/normal_5fceda782b474.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/how_do_i_find_my_hotpoint_oven_model_number.pdfIn PDF document text
    • http://feldhaus-klinker-plitka.ru/www_aventuras_cancan_com_registrarsezlm10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391024/normal_602c66c9ebf07.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460070/normal_5ff96790dfef2.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/napejaxosinages/dakejaxitenuxidilarabute.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_off0000ec83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC83 5076 bytes
SHA-256: d7263fa90ce943d3725b129c04b2fa6fda9222c7edbe574d500fd89daf652b53
font_01_sfnt_off0000fdb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB0 11248 bytes
SHA-256: 46302d3aab17e39120d875cbcf7c9008029cb552f8aafd903e98c36602e94f52

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