Malicious PDF — malware analysis report

Static analysis result for SHA-256 59dec6293648d82d…

MALICIOUS

PDF

75.2 KB Created: 2021-03-28 17:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 4a7954f1ce5d175bb635ee1dfc190bed SHA-1: 2ed856deafa5915689fd472511dbfcc993a0361e SHA-256: 59dec6293648d82d7b6ec557c8792fbaa0c9d3f7c8d1eac4e18c3287dc37a212
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to distribute malicious content or manipulate search engine results. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/strik?utm_term=tying+knots+for+carp+fishing PDF link annotation
    • http://zesisoxesevi.22web.org/what_is_the_meaning_of_nicomachean_ethics.pdfIn PDF document text
    • http://gidujoluj.mypressonline.com/76606969574.pdfIn PDF document text
    • https://porojole.weebly.com/uploads/1/3/4/4/134462866/redixafusidojo.pdfIn PDF document text
    • https://vilekelapufixev.weebly.com/uploads/1/3/4/5/134508089/4b10be2d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422620/normal_5fff26fe00bb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448980/normal_60339dfb4251f.pdfIn PDF document text
    • https://dukazegisow.weebly.com/uploads/1/3/0/7/130740117/7074440.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407100/normal_6036b497d0d51.pdfIn PDF document text
    • https://marotebage.weebly.com/uploads/1/3/4/7/134712984/worebogokoxogeben.pdfIn PDF document text
    • https://towotadop.weebly.com/uploads/1/3/2/6/132682697/699ac4a53ca188.pdfIn PDF document text
    • http://gadivawiw.sportsontheweb.net/biogas_production_notes.pdfIn PDF document text
    • http://bivaxosufuxibo.mygamesonline.org/82677093647.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371509/normal_5fd0ecf82f9a5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pamapubosozule.epizy.com/annual_return_form_27_under_factories_act.pdfIn PDF document text
    • http://releboxodaw.rf.gd/74383729036.pdfIn PDF document text
    • http://murapimopavopa.myartsonline.com/60141039200.pdfIn PDF document text
    • http://selosaxugi.epizy.com/adblock_microsoft_edge_android.pdfIn PDF document text
    • http://rakemexovujepez.epizy.com/blaupunkt_ms40bt_manual.pdfIn PDF document text
    • http://wevikokuzufos.epizy.com/punawuvubozuzurujo.pdfIn PDF document text
    • http://vutogebufuz.myartsonline.com/30381273504.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_off0000ea8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8D 5360 bytes
SHA-256: 66f4669c2e2c7d218ee320ec8660931444c72fbfb4d5a7539b6c7e496bc41202
font_01_sfnt_off0000fce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE2 10172 bytes
SHA-256: 252ad827b1dac3575c37a39a9dc663e11a640480e090cbefaaeb40df3bbf215c

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