Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca50c1584efc24e…

MALICIOUS

PDF

69.5 KB Created: 2021-02-24 08:29:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7c20fe0ca18adeee5b7a186724fa16b3 SHA-1: d43f865403cfe5ef1e4bbd61031eb03a0be07943 SHA-256: 4ca50c1584efc24e44a0e0c5f7ca469a41c9bfacf0966406e164d0935c53770d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to obscure the ultimate destination. Heuristics indicate this PDF is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged it as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=alter+bridge+blackbird+tab+book PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485946/normal_5fcfe5499d4de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376858/normal_6005c879b9ed1.pdfIn PDF document text
    • https://cdn.sqhk.co/nedovipirumu/cJhihaO/hd_filter_camera_photo_editor_photo_collage.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499972/normal_601209510bf00.pdfIn PDF document text
    • http://samyog.ru/dosafinosoguxakob3isdq.pdfIn PDF document text
    • http://iwhite.space/health_the_basics_rebecca_donatelleo5zdl.pdfIn PDF document text
    • http://thedefenseforge.com/wutewelediihoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482870/normal_6022ef69ab7e8.pdfIn PDF document text
    • https://werirubiteda.weebly.com/uploads/1/3/5/9/135972418/dowoximanotapulad.pdfIn PDF document text
    • https://zekulereloto.weebly.com/uploads/1/3/2/7/132710655/1d1399a7ffe8.pdfIn PDF document text
    • https://debovibeki.weebly.com/uploads/1/3/4/7/134715081/777c06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455387/normal_5fdbb3e7ce1a7.pdfIn PDF document text
    • https://gamitodotabezoj.weebly.com/uploads/1/3/1/4/131453651/aa5720e8.pdfIn PDF document text
    • https://xixurisegiwawaz.weebly.com/uploads/1/3/4/0/134012782/semikiv-tifisiw-wosukesimogaru.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386595/normal_5ff40fb648e90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405644/normal_60195649013a4.pdfIn PDF document text
    • https://cdn.sqhk.co/vasegodesazu/hcGVUkf/shark_attack_victim_maine_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD291 5124 bytes
SHA-256: db8d4496196c5e86b24eef0b297b0ab1c47c746f15b73e0afb314bf5f6e56400
font_01_sfnt_off0000e40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40D 11012 bytes
SHA-256: 89035c036c3d4c70ea2938971ccfe9380c8d1bca7146a5eba88305fbefae1ac5

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