Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb1f8c061bf45331…

MALICIOUS

PDF

82.6 KB Created: 2021-05-15 11:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 310bd2a16e2bfbf45c8321ecd8602d6b SHA-1: 96098090ba86ad8be7b8c488d06a51e69e886e2e SHA-256: cb1f8c061bf4533154129ed76955da67871e3c4bd611364768f501829fab8f09
186 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a PDF link farm. It contains numerous external links, many pointing to disposable hosting, suggesting an attempt to manipulate search engine results or distribute further malicious content. While no scripts were explicitly extracted, the presence of external URIs and the link farm behavior indicates a potential for malicious redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://golowaki.ru/strik?utm_term=manifesto+del+partito+comunista+marx+engels PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451221/normal_602e98b225159.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471238/normal_601d93382ca16.pdfIn PDF document text
    • http://barashik.space/jubosofafejekosaroxamroiz4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410006/normal_60210f2689127.pdfIn PDF document text
    • http://lnstagram-help-businesss.com/globe_and_mail_marketing_reporter040wj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464530/normal_5fdc378814f61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494433/normal_5fc6b0f24eefe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453907/normal_5fd2c4cb571c6.pdfIn PDF document text
    • http://wozuxel.getenjoyment.net/5598587901.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447877/normal_60108d00ba7ac.pdfIn PDF document text
    • http://tafiwon.mywebcommunity.org/expanding_tactics_for_listening_teacher_s_book.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454286/normal_5fdde6819754e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://113c517c-d7b0-4b36-99d7-6722bcb7ef36.filesusr.com/ugd/8e66a5_e2b50240c14140a98a1435ad5eaf8771.pdf?index=trueIn PDF document text
    • http://lewiwosu.epizy.com/60118894861.pdfIn PDF document text
    • https://f7f2eb1f-4ce6-40bf-b337-6bcc2c9c1a95.filesusr.com/ugd/dc6899_0b97d8e9f53b45adb0a549833d59ce8f.pdf?index=trueIn PDF document text
    • https://460eb545-5389-4aa9-9e78-d1074a8bca0c.filesusr.com/ugd/21a131_ab9cd84b8c9a4a68a683bf9a3597641f.pdf?index=trueIn PDF document text
    • https://d0fd22f1-78bd-4368-960d-2a324028b2bb.filesusr.com/ugd/a4d998_3694bbb8c23b491189c5d1366c5defdb.pdf?index=trueIn PDF document text
    • http://sekijipaladi.epizy.com/kibiputujuzofabo.pdfIn PDF document text
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_f19d159cdc5c44eaaf9b2fccd8003e5c.pdf?index=trueIn PDF document text
    • http://wupidusujimi.myartsonline.com/59773131116.pdfIn PDF document text
    • http://fojakosi.atwebpages.com/pakuduxoboba.pdfIn PDF document text
    • http://dijaduluka.epizy.com/bu_bhopal_time_table_2020.pdfIn PDF document text
    • http://wixesikive.epizy.com/anesthesia_drugs_chart.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_off00010385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10385 5548 bytes
SHA-256: 5eba1a1cca9932e5886c8c6c77540dd8c32eab2e35ee6276154aaf59a1bb314a
font_01_sfnt_off00011662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11662 11952 bytes
SHA-256: 615baa10659d4d7cf9f00e52b893b55b26f0b75703a61ebe96df295078b2035b