Malicious PDF — malware analysis report

Static analysis result for SHA-256 483b94eb06aa0769…

MALICIOUS

PDF

100.0 KB Created: 2021-03-02 12:48:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 91438763b82eb77be9a877bd19a5e904 SHA-1: d53ba9a60c3577dede76c07a63d15eb47d1bd842 SHA-256: 483b94eb06aa0769cc3e96f861e7266653145941352389b28c4f279848bc0a58
186 Risk Score

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 manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to lead the user to a compromised or malicious resource.

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://kuzutuzo.ru/strik?utm_term=linksys+ac+1200+wi-fi+range+extender PDF link annotation
    • https://bumobuzeki.weebly.com/uploads/1/3/4/4/134477779/2f1b6627f.pdfIn PDF document text
    • https://cdn.sqhk.co/noxuluni/SidYQQq/bupasojazomomosuzav.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/hgdXjja/ben_10_wallpaper_download_hd.pdfIn PDF document text
    • https://zomereke.weebly.com/uploads/1/3/5/3/135397468/ba093d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487186/normal_5ffda35ce47f4.pdfIn PDF document text
    • https://faruroju.weebly.com/uploads/1/3/5/9/135986438/5232391.pdfIn PDF document text
    • https://cdn.sqhk.co/dufimogemeka/iheieti/67825055401.pdfIn PDF document text
    • https://bipufufutugudov.weebly.com/uploads/1/3/1/1/131164095/wefiru.pdfIn PDF document text
    • https://jixawapideraje.weebly.com/uploads/1/3/3/9/133997308/c598fdc1d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404292/normal_601e874d9104b.pdfIn PDF document text
    • https://cdn.sqhk.co/xelalizogim/jiiha3B/36388739585.pdfIn PDF document text
    • https://kazuvamelu.weebly.com/uploads/1/3/0/7/130738637/d5b71fa32c2.pdfIn PDF document text
    • https://cdn.sqhk.co/rubutemoxe/hggijia/highway_rider_gameplay.pdfIn PDF document text
    • https://zuwadakake.weebly.com/uploads/1/3/4/6/134664894/1506064.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/wutogugej/sole_treadmill_service_technician.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/how_many_calories_in_a_boston_kreme_dunkin_donut.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/ventilator_associated_pneumonia_nice_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/amendment_in_right_to_information_act_2005.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_off00014a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A04 5780 bytes
SHA-256: 68a4aee1f477156213368e7bc0be56f4c8c18fd2dbb82d966889b85a7bb92f44
font_01_sfnt_off00015dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DFB 10808 bytes
SHA-256: f334064d1b7442204f5366524cc29db91f37e9ec1e20e7b2eb2824b34e20d76d

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