Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa4135dc3b326691…

MALICIOUS

PDF

74.8 KB Created: 2021-03-21 23:12:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dec91052eb9a058d2c59809228a0ee67 SHA-1: e188592dcc68c44d3d9469cc7a849b5abdddbcbe SHA-256: fa4135dc3b326691011e0b02c658092b758361824dbe4668985eead956a4e5fd
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs that redirect to external websites, identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and the nature of the heuristics suggest an attempt to direct the user to a compromised or malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://seumenha.ru/wix?keyword=death+with+interruptions+pdf
    • https://cdn.sqhk.co/sumavevop/heDxHjf/blood_pressure_chart_by_age_and_height_2020.pdf
    • https://static.s123-cdn-static.com/uploads/4489983/normal_5fde59449ae3a.pdf
    • https://static.s123-cdn-static.com/uploads/4366000/normal_5ff8f5480f41a.pdf
    • https://cdn.sqhk.co/bupabumo/ifjjDja/monkey_bread_with_butterscotch_pudding_in_9x13_pan.pdf
    • http://govnosiakxws.online/278074875555boge.pdf
    • http://sweetygirl.club/5359137084821poy.pdf
    • http://osthondroz.com/dozalakukuxuzo87k.pdf
    • https://cdn-cms.f-static.net/uploads/4408587/normal_604d33d41fe1a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zakunafu/6232004658.pdf
    • https://s3.amazonaws.com/viromibukoleliw/instagram_followers_apk_modded_free.pdf
    • https://uploads.strikinglycdn.com/files/9ba0d68f-3d3e-4dfa-a065-7eed87a7f9bf/xifepipofutuwewanu.pdf
    • https://uploads.strikinglycdn.com/files/f105ec92-ea57-4e74-bd0b-0908cbe4cec1/74916736570.pdf
    • https://s3.amazonaws.com/zebarufuridorur/caldera_rip_v12.pdf
    • https://s3.amazonaws.com/tibitexil/686300699.pdf
    • https://s3.amazonaws.com/sonutopexaramuf/tupapotananadalujuk.pdf
    • https://s3.amazonaws.com/rubidokezive/dowaxajimajelabeg.pdf
    • 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_off0000e622.bin
9516bb25f7cfcf42be593a506a45b45c0529b6f6a87dc15cb5784cc9ea4fc5f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE622 5188 bytes
font_01_sfnt_off0000f7db.bin
7609b1ca9b64bd7159d930f45acadca7e568042f2b7223acc228f10d90277a26		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DB 10916 bytes

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