Malicious PDF — malware analysis report

Static analysis result for SHA-256 419a50564cab706e…

MALICIOUS

PDF

82.5 KB Created: 2020-12-17 06:48:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1dff09483618ea4a297873a549f0e3d0 SHA-1: e5ccb8f35b0c65378c05304fadf3a106f1919d8e SHA-256: 419a50564cab706ec8c01caa4375fe96e39de4717088733983df6dded9ec3e54
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms and potentially phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. The embedded URL 'https://trafffi.ru/123?utm_term=normas+del+buen+hablante+y+oyente' is likely part of this malicious infrastructure.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://trafffi.ru/123?utm_term=normas+del+buen+hablante+y+oyente PDF link annotation
    • https://dutedurelixuvu.weebly.com/uploads/1/3/4/3/134320021/d638f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406806/normal_5fa3b6a7e5b8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371014/normal_5f8c4b135b4ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368952/normal_5f95e9bb5b942.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366340/normal_5f871508e9b7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383917/normal_5f8e5e7961ad6.pdfIn PDF document text
    • https://jenodefutufute.weebly.com/uploads/1/3/4/3/134373351/6365730.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/d684583c-1f1c-4131-93a8-60f4d0567818/sally_mann_hold_still.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/366ef134-576e-4173-a538-28f86650bbe2/read_dragonsong_by_anne_mccaffrey_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74c9e73f-b45a-4d2e-873c-5ac742bf2b38/kerudusowarigalad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48743bf2-ed3b-406e-930f-f6226da14f3b/bujugelujunipawikagaga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ea45ff7-3705-4a51-89b8-e287fb948f82/dragon_ball_xenoverse_apk_obb_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8eed0a18-0863-4c74-8b77-500e8050a0b6/snaps_for_clothing_how_to_put_on.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/firefox_portable_52._9._0.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF893 5108 bytes
SHA-256: 683a6e863ae2b1ba68251b7effface2db6de140b27de4532ed8784a6c45296db
font_01_sfnt_off000109bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BD 10872 bytes
SHA-256: fbd363d6933ed09733c4dd0cec252c4769c04dae70d45c5efac70388d2012fe3
font_02_sfnt_off00012d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D40 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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