Malicious PDF — malware analysis report

Static analysis result for SHA-256 52fe60c71c0c36bf…

MALICIOUS

PDF

77.0 KB Created: 2021-03-01 00:55:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 398090898339586e366aea3a1f73305c SHA-1: a8c307c1e16bb6ea980d11f61d54bed898a121fc SHA-256: 52fe60c71c0c36bf20d12411aaa762ee5ad01db47a4b7e3b122fab8ff022bf90
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with the primary one being https://crophysi.ru/award, suggesting a phishing lure. The PDF also references a link farm on disposable hosting, indicating a common tactic for distributing 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://crophysi.ru/award?keyword=hamilton+beach+2-way+flexbrew+coffee+maker+reviews PDF link annotation
    • http://tejasatobes.medianewsonline.com/22020761202.pdfIn PDF document text
    • https://nosujufan.weebly.com/uploads/1/3/1/0/131070407/572847.pdfIn PDF document text
    • https://dufibivi.weebly.com/uploads/1/3/5/3/135346242/f8fca747.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465938/normal_5fdd1bd85cb7f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385026/normal_5feb3fe983202.pdfIn PDF document text
    • http://xegazinijitup.mywebcommunity.org/9708588583.pdfIn PDF document text
    • http://kobivoweder.mypressonline.com/18369779881.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408481/normal_5ffcffc541ca3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483345/normal_602e4a07a1c91.pdfIn PDF document text
    • http://siwivelijutore.medianewsonline.com/3709439975.pdfIn PDF document text
    • https://pagajunudew.weebly.com/uploads/1/3/5/9/135992687/f2f8e0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479237/normal_601da8123f020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://texatopewewew.epizy.com/11351503760.pdfIn PDF document text
    • http://pizuzol.onlinewebshop.net/47947058500.pdfIn PDF document text
    • http://fokoxowikelejex.rf.gd/joshua_tree_national_park_guide.pdfIn PDF document text
    • http://xowilewegiwo.myartsonline.com/what_do_you_understand_by_the_term_security_analysis_what_is_its_objective.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_off0000f04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04E 5772 bytes
SHA-256: 04fa6b02a494f68137970c2ab97fe841c635c92e7855506995979a21adb41918
font_01_sfnt_off000103f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F5 10240 bytes
SHA-256: 68278fee6dd431afd1527759f7f287f30093318f4793e12c627c984a961d3568

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