Malicious PDF — malware analysis report

Static analysis result for SHA-256 e502c845efc1c079…

MALICIOUS

PDF

64.3 KB Created: 2021-02-22 09:21:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bc4bccb740437a9b1daa3a57f5afe7f3 SHA-1: 9ebe4ff292cbcdf6aa1827dce68ecee451aae4e1 SHA-256: e502c845efc1c07994bb11cc9bcaf426192b5ae593a6270ce69477301c158ff5
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with a notable link farm heuristic suggesting a disposable hosting strategy. The document body, though heavily obfuscated, appears to be a lure related to an academic textbook, likely intended to trick users into downloading further malicious content.

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 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/wix?keyword=abnormal+psychology+comer+8th+edition+pdf PDF link annotation
    • http://nigma24invest.online/amphibolite_rock1snlj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422877/normal_60153861e80b5.pdfIn PDF document text
    • http://eurozone.pro/fusozemawefe151se.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458623/normal_6017c73cd2727.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369160/normal_600fb022c59f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421215/normal_5fdb7be08caa4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465274/normal_5fe2271c5b368.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394066/normal_5ffcefdad7a55.pdfIn PDF document text
    • http://raffle.website/19378682224ynu2g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454819/normal_5ff6ad5aaa0f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390382/normal_600ea154807f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465691/normal_5fde3fcd611e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494875/normal_6002753c4d78f.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/jivala/6405143972.pdfIn PDF document text
    • http://novosumagib.epizy.com/32417313126.pdfIn PDF document text
    • http://dupivet.epizy.com/lagekaviwafo.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/loxupepom.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/dilezanomagubugekodipiw.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_off0000bf39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF39 5996 bytes
SHA-256: 633bdff5f3b1eb804ffeb8599af8baffae286579d6aba17f2333fec95fdbe9e1
font_01_sfnt_off0000d370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD370 9604 bytes
SHA-256: cc99a1ddf4112313c0d1ca28f3f2136b3b5ffd777f817a4d74bb0319abc07eab

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