Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ed1c5925a0ef2d7…

MALICIOUS

PDF

67.0 KB Created: 2021-01-24 20:59:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5ce1cda8079ae4f37cdaf9ab6fdac7f3 SHA-1: 76433ecdd3a51a08579455439766fdacedb223c6 SHA-256: 3ed1c5925a0ef2d740c0f4b24bd1f21bbc69634bea2418edb4aef1343e9e9867
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by heuristics as a link farm designed for malicious purposes. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

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://baarspo.ru/123?utm_term=amazon+step2+table+and+chairs PDF link annotation
    • https://jazediwugitali.weebly.com/uploads/1/3/4/7/134730671/gijinozizen-wivelobaxiwanux.pdfIn PDF document text
    • https://wovogivas.weebly.com/uploads/1/3/4/0/134012667/9150920.pdfIn PDF document text
    • http://remont-kholodilnikov.website/wargames_flags_15mmcza9e.pdfIn PDF document text
    • https://bipufufutugudov.weebly.com/uploads/1/3/1/1/131164095/9b84b916ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465142/normal_5ff6747ed61a3.pdfIn PDF document text
    • https://toraboretopupu.weebly.com/uploads/1/3/4/7/134769369/79568af28918687.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481162/normal_600843c6bf63a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463543/normal_5ffcd68aa91ee.pdfIn PDF document text
    • https://levibaxa.weebly.com/uploads/1/3/1/4/131408620/2473798.pdfIn PDF document text
    • https://powudeli.weebly.com/uploads/1/3/4/7/134772307/a9cfa58b4406.pdfIn PDF document text
    • https://soresewo.weebly.com/uploads/1/3/1/0/131069968/fukufeziv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496826/normal_5ffe7b8a5b03e.pdfIn PDF document text
    • https://gabejopow.weebly.com/uploads/1/3/4/5/134597712/81574cb.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/xakapudakadu/21576677203.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_off0000c7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DD 5624 bytes
SHA-256: e1a2c4ff83aa5186a1e4c33f7b9844764e813cc204cb078eed608c69ded1cf54
font_01_sfnt_off0000dacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACF 10656 bytes
SHA-256: 7947bffdb070b95e7d0c59887ea10ee6068b33f2ff544ab8e1af52c7135174b2

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