Malicious PDF — malware analysis report

Static analysis result for SHA-256 206e22c36d18ac1c…

MALICIOUS

PDF

78.0 KB Created: 2021-02-23 15:47:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5d1ea30f6a084672fde545be226e1756 SHA-1: ed3918508151f63a1d04c7f12c471e176196e70e SHA-256: 206e22c36d18ac1ccd50fad456c46b79fb296057d067d8bde01a662a8fdbc606
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It contains numerous external URIs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users. The primary malicious URL identified is https://druttle.ru/strik, which is presented in the context of 'Strong's concordance hebrew' to deceive the user. No scripts were extracted, but the PDF structure and numerous URLs suggest a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/strik?utm_term=strong%2527s+concordance+hebrew+3335 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4500692/normal_5fd148d6cdb8e.pdfIn PDF document text
    • http://skameyki.club/fanumazidotivatizil1ru.pdfIn PDF document text
    • http://espaceabonnes.com/the_hateful_eight_movie_dual_audio4xwkg.pdfIn PDF document text
    • http://lamovingcompany.com/shiba_inu_training_guideet8uu.pdfIn PDF document text
    • http://clobuss.ru/nazm_hikmet_iiri_szleriqh22b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419206/normal_5fdd3e5cbb31b.pdfIn PDF document text
    • http://supermagazforsale1.xyz/38935155705xvkai.pdfIn PDF document text
    • http://momsmall.space/ryobi_compound_mitre_saw_manual6otet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409604/normal_6010b07cddf5f.pdfIn PDF document text
    • http://richmaya.site/27312457909clu1g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368777/normal_602becf4819d1.pdfIn PDF document text
    • http://world-wildshop.com/42914411891a0br7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369516/normal_601424314fb1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454046/normal_5fe45d9326b9b.pdfIn PDF document text
    • http://trikotoria.ru/995314585699gcuk.pdfIn PDF document text
    • http://migerov.xyz/73441309248jtf2a.pdfIn PDF document text
    • http://tryraisins.club/53253513680vz87a.pdfIn PDF document text
    • http://inglassrus.ru/blackberry_android_pie_updatemgzzf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/80172030093.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/ccrt_scholarship_form_2017-_18.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_off0000e20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20F 5828 bytes
SHA-256: b159a18f75c2764953c5bf80ca26ee5dc8b269e597e764b6a19773a78e059dbb
font_01_sfnt_off0000f5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F9 16572 bytes
SHA-256: 0258c04aca610fefd0079c37b016bc3a85cc8bb1ffce9c8f65a95cd7ca00e8e3

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