Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9b60b1a37c9445b…

MALICIOUS

PDF

72.7 KB Created: 2021-02-11 16:57:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 27286e06fbed51c61fa2f7ed7c276c20 SHA-1: 7c393974336659af94df51e4d4d4b2114d904f96 SHA-256: f9b60b1a37c9445b6952d231a50ce1f7635010bc916fa576f5602ceb12c815c7
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://jottigo.ru/123?utm_term=5e+lightning+lure+polearm+master PDF link annotation
    • https://fekodajitor.weebly.com/uploads/1/3/0/8/130874258/020062edd01c177.pdfIn PDF document text
    • https://zumuwezejulo.weebly.com/uploads/1/3/1/4/131455722/1779272.pdfIn PDF document text
    • http://kewisanoxiv.66ghz.com/wupuvefesedopowam.pdfIn PDF document text
    • https://xagewomovow.weebly.com/uploads/1/3/4/0/134040632/rapixaxovajobemiwa.pdfIn PDF document text
    • http://zesisoxesevi.22web.org/nidas.pdfIn PDF document text
    • https://tunizobun.weebly.com/uploads/1/3/1/0/131069832/6636879.pdfIn PDF document text
    • https://xuxukiworizep.weebly.com/uploads/1/3/4/7/134723333/e2534d8ff3e34.pdfIn PDF document text
    • https://vobogokofudukig.weebly.com/uploads/1/3/0/7/130775751/zaxebekidogir.pdfIn PDF document text
    • https://tobotegitemusir.weebly.com/uploads/1/3/4/6/134651307/fasubobovakujuz.pdfIn PDF document text
    • http://bisikar.22web.org/favanivediraxu.pdfIn PDF document text
    • https://jiwozipepogi.weebly.com/uploads/1/3/4/4/134462700/guforu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wapinogure.epizy.com/plastazote_foam_sheets_uk.pdfIn PDF document text
    • http://fibalikirikoti.epizy.com/transformers_siege_war_for_cybertron_barricade.pdfIn PDF document text
    • http://mogadaf.epizy.com/imovie_storyboard_template.pdfIn PDF document text
    • http://wuxatafadakifu.epizy.com/70770626916.pdfIn PDF document text
    • http://vijanemafe.rf.gd/briggs_and_stratton_450e_parts_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/mepuzezege.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_off0000df88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF88 5264 bytes
SHA-256: f2d331728a82b63397258ac5adc3dea60a674301de5f638dbb9d2dcee895b3f3
font_01_sfnt_off0000f138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF138 10728 bytes
SHA-256: 5569b60ff0314a60b912ade15e36f779c1a73fbed82e68f70e06dff1fb681689

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