Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d724302d61ffe8…

MALICIOUS

PDF

77.0 KB Created: 2021-01-19 07:47:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: c8d997f4d193bb2f4df57a808c7c3ec6 SHA-1: 482bcedc3926afe24f1810ae85bcf6847a20cccc SHA-256: c2d724302d61ffe8a427211a82095eaabb19f033924958c75d832ec15a8b2ffc
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards exploitation or redirection.

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://trafftec.ru/123?utm_term=soleil+heater+keeps+shutting+off PDF link annotation
    • https://rofipufexorijol.weebly.com/uploads/1/3/4/6/134656377/peruzolugafisolu.pdfIn PDF document text
    • https://buzubexod.weebly.com/uploads/1/3/4/0/134017192/02a665516.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409096/normal_5fcdd0584115b.pdfIn PDF document text
    • https://cdn.sqhk.co/jizuxadif/ZgfW0GW/vemefevawitod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380237/normal_5ff1595b4d1af.pdfIn PDF document text
    • https://garagagu.weebly.com/uploads/1/3/4/3/134364865/gividujumomolegel.pdfIn PDF document text
    • https://cdn.sqhk.co/wugunifikezu/emhiKic/pocket_academy_zero_structures.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489730/normal_5ffe0716c0080.pdfIn PDF document text
    • https://fawimerena.weebly.com/uploads/1/3/4/6/134630635/e102d9fb5c9f06.pdfIn PDF document text
    • https://zetidikusas.weebly.com/uploads/1/3/4/7/134740093/tikudov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380413/normal_5fdbaa0d905c5.pdfIn PDF document text
    • https://sefewazugep.weebly.com/uploads/1/3/5/2/135293251/surobo.pdfIn PDF document text
    • https://cdn.sqhk.co/pumopijaku/79hh1hc/lapenubufegukixefejon.pdfIn PDF document text
    • https://cdn.sqhk.co/letabuner/iRjcc34/52024809697.pdfIn PDF document text
    • https://site-1172149.mozfiles.com/files/1172149/bupinidi.pdfIn PDF document text
    • https://dugeditukuvil.weebly.com/uploads/1/3/4/7/134723955/togigaxijafof.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/waxapoz/best_birthday_songs_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/steel_gauge_thickness_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/cdc_antibiotic_guidelines_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/bezuderutefab.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_off0000f227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF227 5328 bytes
SHA-256: e36c203b990d0228a3485298ffd3834117ab4b4c05e7bee84ff4d89439d51101
font_01_sfnt_off0001043c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043C 9984 bytes
SHA-256: 14563660b17eda03044b0ca2bb2c6e026a61eeb52a22249d111aa77c57ea3c32

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