Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9fce0c23a4dad3f…

MALICIOUS

PDF

62.4 KB Created: 2021-01-14 13:11:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 82806a14abc91346edbe4e56b0a7da12 SHA-1: 96fafc23ee5452e7d390130ef2f46ed917558b1e SHA-256: b9fce0c23a4dad3ffdb9ff852207bd6078b91b29f1b36a46973c76bf97d6bce6
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains numerous embedded links, many of which point to external websites, including a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links designed to appear as a resource for incremental games, a common lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware.

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
  • 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://cctraff.ru/aws?utm_term=best+android+incremental+games+2019 In PDF document text
    • https://sujanumijixedi.weebly.com/uploads/1/3/4/5/134501714/2967072.pdfIn PDF document text
    • https://vejupurujiku.weebly.com/uploads/1/3/1/6/131606174/b1c47fbbbeb4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446399/normal_5ff766cb117f4.pdfIn PDF document text
    • https://xiwofisenitew.weebly.com/uploads/1/3/4/8/134879753/tulivonigexa.pdfIn PDF document text
    • https://marezupudi.weebly.com/uploads/1/3/0/8/130874377/palizezomux.pdfIn PDF document text
    • https://muwewemumefiga.weebly.com/uploads/1/3/0/8/130874681/b0ca63a.pdfIn PDF document text
    • https://xonuveviriniw.weebly.com/uploads/1/3/0/7/130738603/xalitawiwom.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/wumodukubaru/kevijejid.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/13555389205.pdfIn PDF document text
    • https://s3.amazonaws.com/luropiw/radiohead_no_surprises_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/93860699583.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/la-z-boy_replacement_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/44421916819.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/10_basic_basketball_rules.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/kozigirilanofebulovisalu.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_off0000b781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB781 5792 bytes
SHA-256: b0a11f507fb65c8630148ecee4c025ee4877417fb7f621bf826b53bf0486e77d
font_01_sfnt_off0000cb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB24 9864 bytes
SHA-256: eb633a40d38123ec4b6ac423aabd006d98c027705afb89647bdf2158e3393bd3

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