Malicious PDF — malware analysis report

Static analysis result for SHA-256 63821d496c18b115…

MALICIOUS

PDF

70.9 KB Created: 2021-01-04 05:45:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bc7e401d2f241b940e2623a711e112a SHA-1: dad6d7393b31c21d85be168c95fc3a581c289a6d SHA-256: 63821d496c18b115fa8c90f8065249877f0dd8ccaffad59fdf674c3d6f994bc9
134 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm hosted on disposable domains, with one URL pointing to a resource that appears to be a guide, likely a lure. The presence of multiple Weebly and other disposable hosting links suggests an attempt to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=metasploit+the+pentesters+guide+pdf
    • https://verafilutawus.weebly.com/uploads/1/3/4/5/134597792/599981.pdf
    • https://kelesidudukakub.weebly.com/uploads/1/3/5/3/135340861/8251e7e.pdf
    • https://cdn.sqhk.co/zozijawutuxu/ghigdic/winking_lizard_tavern_menu.pdf
    • https://goxezojukaruvuk.weebly.com/uploads/1/3/4/0/134000107/0c0245026.pdf
    • https://sebonegipuwi.weebly.com/uploads/1/3/4/1/134108682/buditegurogopow.pdf
    • https://panesiwosejel.weebly.com/uploads/1/3/0/7/130739396/vaparokoti.pdf
    • https://cdn.sqhk.co/jutafegobexe/IhdyIEN/jifebafetogudisufutuget.pdf
    • https://difodofixipa.weebly.com/uploads/1/3/0/8/130814112/5069447.pdf
    • https://luxoxika.weebly.com/uploads/1/3/4/8/134899107/pevifejunofijew_buputunedovapi.pdf
    • https://bovuxugiz.weebly.com/uploads/1/3/4/9/134901291/niluzobiparot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/38ff2cf5-7ebc-4898-996b-35ddaa497f79/68014674495.pdf
    • https://s3.amazonaws.com/fowonaxul/kumon_math_worksheets_for_grade_2.pdf
    • https://uploads.strikinglycdn.com/files/aa32863f-4d3b-4733-99a5-5b3cebbeb4e2/barizevejapoxutaro.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_off0000d6e0.bin
bf92335ae2102af1f678a87bcb4a5367b3ded60ae6c534f1c9f2d8bacd009c84		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E0 5308 bytes
font_01_sfnt_off0000e8f0.bin
91ad4371dd8cfafe89fc2e6e65e176dc7ed313e12b883b433148f4bc245e2e78		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F0 11684 bytes

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