Malicious PDF — malware analysis report

Static analysis result for SHA-256 d27fb3b6113632ae…

MALICIOUS

PDF

83.5 KB Created: 2021-02-21 08:42:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 40fe11b1c53ed39f32b55ec481dfa3e0 SHA-1: e4daf193329e06d95bbeb237b3f3cea6fdc97b9e SHA-256: d27fb3b6113632ae3b72b63e085773b153e22133afc31f55127a6f2941d20220
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are SEO-optimized and point to other PDF documents. This behavior is indicative of a link farm or SEO spam campaign. The presence of ClamAV detection and ML classification further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/wix?keyword=pennridge+south+middle+school+football PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4492555/normal_5fe42d1ad59d0.pdfIn PDF document text
    • http://tumbaa.space/john_c_maxwell_teamwork_101gq708.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464852/normal_602b29773888a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421464/normal_5fdf385cbd2ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384483/normal_5feea0da11145.pdfIn PDF document text
    • https://retarabad.weebly.com/uploads/1/3/3/9/133997928/gajisuk.pdfIn PDF document text
    • http://sanegofelofut.22web.org/92146385865.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366022/normal_5fea072cbefe6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459794/normal_5fe53cd2466e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454435/normal_5fcb97971de04.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367283/normal_5ff0a3af59584.pdfIn PDF document text
    • https://jugurapofan.weebly.com/uploads/1/3/4/3/134339640/9375784.pdfIn PDF document text
    • http://odebayitrafikhizmeti.com/20856753399c6nwj.pdfIn PDF document text
    • https://vewenaloviriwu.weebly.com/uploads/1/3/2/8/132816087/wilutafuzerin-radesoru-fupes.pdfIn PDF document text
    • http://helper-badges.com/518786053999dhtb.pdfIn PDF document text
    • http://giocodigital.website/free_brain_games_for_seniors_ukcprrw.pdfIn PDF document text
    • https://konomotawet.weebly.com/uploads/1/3/1/3/131379362/ec0473df.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zoxuditavuvov.rf.gd/1176424533.pdfIn PDF document text
    • http://posojorodinu.epizy.com/6330207597.pdfIn PDF document text
    • http://gemakeruw.epizy.com/final_countdown_piano_sheet.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_off00010b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B06 5576 bytes
SHA-256: c38d99733498fbc92f186c87bcfb43b6e3703503dc9f3af1db7a77a6468b0d90
font_01_sfnt_off00011dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD0 10124 bytes
SHA-256: 213bad91471cc3ef1e9d44979facb8845424e124a5fa92caa02953f25a9966e4

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