Malicious PDF — malware analysis report

Static analysis result for SHA-256 c89357d88fcd0f22…

MALICIOUS

PDF

64.9 KB Created: 2021-05-13 01:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8ea7e54dd436185d2c3530ab3a39b2bd SHA-1: 599e1fbe515af87e25cf5eba8c577b49425aa9b3 SHA-256: c89357d88fcd0f22abeaeca6ae9219b597906887043071173fece54293ce762c
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by ClamAV as Pdf.Phishing.Trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is a link farm on disposable hosting, and the ML classifier strongly suggests maliciousness. The primary URL, 'https://xezojetit.ru/strik?utm_term=poulan+2300+chainsaw+parts+diagram', is likely used to redirect the user to a malicious site. No scripts were extracted from this sample.

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://xezojetit.ru/strik?utm_term=poulan+2300+chainsaw+parts+diagram PDF link annotation
    • https://cdn.sqhk.co/kuwusemob/jathiji/tigesavezodavawazezodoju.pdfIn PDF document text
    • https://tovamegudisolos.weebly.com/uploads/1/3/1/4/131411857/7100707.pdfIn PDF document text
    • https://cdn.sqhk.co/busanurutar/RigdjRs/wedekevamamijuvebobi.pdfIn PDF document text
    • https://zizojatemizowen.weebly.com/uploads/1/3/4/0/134016780/7af3ee5f69911.pdfIn PDF document text
    • https://cdn.sqhk.co/zevinikiwi/cYjgdja/miniature_wargames_magazine_website.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4531626/normal_60293768d6dbf.pdfIn PDF document text
    • https://cdn.sqhk.co/sebutarukaw/hgchaBx/dimenezupaku.pdfIn PDF document text
    • https://cdn.sqhk.co/kakapoxavu/heicghx/what_video_editing_app_do_tiktokers_use.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501777/normal_60198611e25f1.pdfIn PDF document text
    • https://rusizatigaj.weebly.com/uploads/1/3/4/0/134041601/2544908.pdfIn PDF document text
    • https://baboxubawuxi.weebly.com/uploads/1/3/4/6/134666135/wexefosawavab_nisedatire_mipevazej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444850/normal_60187d43dfc0e.pdfIn PDF document text
    • https://cdn.sqhk.co/zinumazak/ghieEUf/lemakupabuzibe.pdfIn PDF document text
    • https://zuxomizo.weebly.com/uploads/1/3/2/7/132710603/8037618.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369504/normal_5fc83bbdac655.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xagejerebim.rf.gd/21844348485.pdfIn PDF document text
    • http://dizoleline.epizy.com/boolean_algebra_formulas.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_off0000bf82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF82 6020 bytes
SHA-256: fe41a3a28d95cee27c7f425b9720f39b1f3289f0ecdd7ea6a47ff9fbc1f79ed6
font_01_sfnt_off0000d3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EC 9684 bytes
SHA-256: 40d9515a4f7bf5369cce6713469908945d45eb5254d0633b55bbdca7a00f4c41

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