Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfe85c251b1195e9…

MALICIOUS

PDF

74.4 KB Created: 2021-06-07 04:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 814f3f7881b6e1b8f71ded5e910154b2 SHA-1: c19141c6a0fbe953bccac7799b32fdf2da9e7496 SHA-256: bfe85c251b1195e940bb0cb65f146a6aed2f9d5d856927971df2dc96920c725c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs and the document's deceptive content point towards an attempt to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://ponafet.ru/123?utm_term=skype+for+business+windows+32+bit PDF link annotation
    • https://zinikigi.weebly.com/uploads/1/3/1/4/131453967/pepevel-bisofir.pdfIn PDF document text
    • https://fukuzemuk.weebly.com/uploads/1/3/5/3/135306557/4501604.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408485/normal_6052b89220e47.pdfIn PDF document text
    • https://kotageluvo.weebly.com/uploads/1/3/4/6/134652464/tilirexu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427076/normal_6017beb076300.pdfIn PDF document text
    • https://kebakiwaranug.weebly.com/uploads/1/3/4/3/134317860/5902761.pdfIn PDF document text
    • https://pegipipuw.weebly.com/uploads/1/3/5/3/135395330/jegagobato.pdfIn PDF document text
    • https://meliwulawobawis.weebly.com/uploads/1/3/5/2/135298556/guwokafuxadawire.pdfIn PDF document text
    • https://kisofoga.weebly.com/uploads/1/3/1/3/131383553/minoxete.pdfIn PDF document text
    • https://mubelumovetofap.weebly.com/uploads/1/3/1/8/131856402/09a606aa5d3.pdfIn PDF document text
    • https://virerulifig.weebly.com/uploads/1/3/1/4/131407283/1826736.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dadilotofexi.pbworks.com/f/53198697893.pdfIn PDF document text
    • http://wexagiz.pbworks.com/w/file/fetch/144760230/hubsan_h501a_x4_air_pro_firmware.pdfIn PDF document text
    • http://mutatalibo.pbworks.com/w/file/fetch/144605529/lapp_kabel_catalogo.pdfIn PDF document text
    • http://zawepiko.pbworks.com/f/78480786199.pdfIn PDF document text
    • http://larabefejaji.pbworks.com/w/file/fetch/144510195/divina_commedia_inferno_canto_13_testo.pdfIn PDF document text
    • http://gufabewa.pbworks.com/w/file/fetch/144753261/monaxelitij.pdfIn PDF document text
    • http://risodige.pbworks.com/f/mofiladopimawakudabur.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_off0000e4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EF 5588 bytes
SHA-256: 49b386bc12dc5b6ba9d179b9de7fbee68552c8714fba2584e664ef7b28bfdaf5
font_01_sfnt_off0000f825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF825 10700 bytes
SHA-256: adea333af9707261e8454d5092023f814f8ea2a42bffeeecda566cde1e9316e8

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