Malicious PDF — malware analysis report

Static analysis result for SHA-256 76e1af3eced035a4…

MALICIOUS

PDF

75.6 KB Created: 2021-02-23 10:43:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e65f6cf2555861351a68d73252b1e7ef SHA-1: f7e462dd40f2d795098f18d55bdec1324745440d SHA-256: 76e1af3eced035a45816f662d4a61cfbd5cb5780fe18e9775951b0825c9e7a22
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO manipulation, likely to host phishing or malware. The presence of external URIs and the overall structure suggest this PDF is designed to redirect users to malicious content, potentially for phishing or malware distribution.

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://maypoin.ru/strik?utm_term=what+is+a+fractured+fairy+tales PDF link annotation
    • https://puwoposujol.weebly.com/uploads/1/3/0/9/130969317/d80ef90be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486199/normal_5fe56e1a6be51.pdfIn PDF document text
    • http://livopazumifena.iblogger.org/jodimexewadu.pdfIn PDF document text
    • https://jiwebatije.weebly.com/uploads/1/3/3/9/133997557/jegezi_wugiwinowep_gulagato.pdfIn PDF document text
    • https://jabakatuni.weebly.com/uploads/1/3/1/0/131071057/kizinibekexolejad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382193/normal_6027eeacbc005.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476601/normal_60195806a81f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380393/normal_60113db81dfc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367005/normal_601635ee6b4c5.pdfIn PDF document text
    • https://xuniruki.weebly.com/uploads/1/3/0/7/130739043/tejixigeneveje-dagimupibopuza-fosaromazilok-werikegexodunid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387244/normal_5ff3b23662299.pdfIn PDF document text
    • https://lizatupapej.weebly.com/uploads/1/3/4/4/134401074/742930.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387420/normal_5fd340d291645.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://punegejofuj.epizy.com/4463783637.pdfIn PDF document text
    • http://nupenujopufidi.epizy.com/12726705445.pdfIn PDF document text
    • http://tixixumusugik.rf.gd/spider-_man_2018_video_game.pdfIn PDF document text
    • http://novabimakokoj.rf.gd/aprilaire_5000_spec_sheet.pdfIn PDF document text
    • http://fazomexaboru.rf.gd/46242351460.pdfIn PDF document text
    • http://jogekofasi.rf.gd/wozawonosumutekimojenugu.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_off0000ea2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2D 5224 bytes
SHA-256: 1800f327f8eb4b7c209646ece850ac7a0174b27e6c36dd451eab9d8fe124c725
font_01_sfnt_off0000fc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC02 10776 bytes
SHA-256: 125c67350932aa451bb5f169d24d116cc72f8eaa0ea800894dffd0fd0da56048

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