Malicious PDF — malware analysis report

Static analysis result for SHA-256 151cb0c75e23fed4…

MALICIOUS

PDF

69.7 KB Created: 2021-01-06 21:36:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 472794599bf20d5739733c84314fffa7 SHA-1: 7ec5be4e4332de108093dd13b69601882daaf562 SHA-256: 151cb0c75e23fed4277e0f2fa0f4edbe87ee9d26c11cf50387a3cb6a9c21c4dc
214 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to external websites, indicating a link farm or redirection strategy. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' strongly suggest malicious intent, likely to drive traffic to malicious or phishing sites. The ClamAV detection further confirms its malicious nature, classifying it as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/123?utm_term=vua+choi+bai+tren+dien+thoai In PDF document text
    • https://cdn.sqhk.co/fewukise/eTzZmhd/penalty_kick_game_poki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386081/normal_5f92075953502.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383915/normal_5f9671973d989.pdfIn PDF document text
    • https://cdn.sqhk.co/dopuwene/e1vXidp/what_are_the_four_buttons_on_alexa.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/7354785.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447888/normal_5fe1572aa6f4a.pdfIn PDF document text
    • https://cdn.sqhk.co/zegofurop/iicdgh4/nfl_week_12_schedule.pdfIn PDF document text
    • https://gokipeko.weebly.com/uploads/1/3/4/3/134351508/jisilobifebi.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/telopubujixamivope.pdfIn PDF document text
    • https://cdn.sqhk.co/jakadamalate/jiahjhi/smart_in_pays_itu_apa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC69D 4804 bytes
SHA-256: bfb0c2c51c70f17aadfdc7e83c364308698d0170f47d01f66d88bbff12e597a5
font_01_sfnt_off0000d6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DC 10932 bytes
SHA-256: f064d078082b81adbae9f0eaf6bf426c11087a7042f27af9ff311034ba6a635d
font_02_sfnt_off0000fc34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC34 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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