Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc3fbd95cef21fb3…

MALICIOUS

PDF

76.5 KB Created: 2021-04-27 09:40:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7eec962a76cd051337a3cde703b653ba SHA-1: d9c3c74751ab41834ddd95a8df812d2bcc6e4c19 SHA-256: bc3fbd95cef21fb3268fdaeb3fd507e8fb68064de37c590a4a24422bc2d10a28
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://zajinet.ru/strik?utm_term=how+to+turn+on+a+toro+leaf+blower PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479718/normal_6016c48a6ca90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489732/normal_60405fd56f3c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365653/normal_5fe6729e74866.pdfIn PDF document text
    • https://lotigasi.weebly.com/uploads/1/3/4/7/134705720/6071381.pdfIn PDF document text
    • https://fajupumivut.weebly.com/uploads/1/3/4/1/134108914/7408817.pdfIn PDF document text
    • https://vutojexi.weebly.com/uploads/1/3/0/7/130776275/99a13f0.pdfIn PDF document text
    • https://powizosiki.weebly.com/uploads/1/3/4/0/134041047/8496791.pdfIn PDF document text
    • http://trastqort.online/sonarqube_dashboard_pluginz9qg8.pdfIn PDF document text
    • https://zuzumesagodufen.weebly.com/uploads/1/3/2/6/132695194/jipelopivukoxo.pdfIn PDF document text
    • http://mizafaroremida.getenjoyment.net/27736314556.pdfIn PDF document text
    • http://hisgohar.site/does_bosch_make_black_stainless_steel_dishwashersyvoyr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378618/normal_6052712f47809.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416661/normal_604172149867d.pdfIn PDF document text
    • https://xeludelibiw.weebly.com/uploads/1/3/4/3/134371965/4950186.pdfIn PDF document text
    • https://lokeduvedip.weebly.com/uploads/1/3/4/8/134885922/vidiwoneselok-kapidusemujedi-foduwuloguxemad.pdfIn PDF document text
    • http://siwupojotuj.getenjoyment.net/ligaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_4562a8be344f4f9ea324f70515e51f0e.pdf?index=trueIn PDF document text
    • https://369206df-e466-4f8f-9771-850d1edb33c5.filesusr.com/ugd/8fd5dc_69bbfc452209400992a1d652b2e25933.pdf?index=trueIn 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_off0000ef92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF92 4776 bytes
SHA-256: 4e946c8ec9ef0706edcb1a5667268d7a7c7755846d1d243f861450294fdb31d6
font_01_sfnt_off0000fff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF4 10868 bytes
SHA-256: 54592d1adbad532eee9b128b6d0050a61951606f0920dba21e7f75b1156e78a2

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