Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a91c02458ab840…

MALICIOUS

PDF

75.7 KB Created: 2021-01-30 07:43:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c867ef9b5989712a633d93877fd5119d SHA-1: 2250b4f0a1bce18b7af38444f6de492b03511ed9 SHA-256: 91a91c02458ab840be904d96acdd2c2baffad0379085b2467686789b76f8d87d
214 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, many of which point to redirector infrastructure and are likely part of a link farm designed for SEO manipulation. The primary link observed, 'https://crophysi.ru/wb?keyword=asphalt%20nitro%20game%20download%20for%20windows%208', suggests a lure for users seeking game downloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/wb?keyword=asphalt%20nitro%20game%20download%20for%20windows%208 In PDF document text
    • https://cdn.sqhk.co/xuxiropuwomo/jazghmo/hitmasters_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/sowojusawepu/iJ2OLgK/al_kahraba_number.pdfIn PDF document text
    • https://cdn.sqhk.co/xafeperale/cndjjfI/zinewalesapifopuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420905/normal_5ff6770b57c12.pdfIn PDF document text
    • https://kizevopizimi.weebly.com/uploads/1/3/5/3/135351298/670b8df.pdfIn PDF document text
    • https://denijebif.weebly.com/uploads/1/3/4/5/134584122/timuwinovejid_sikasewawetako_vixeridoni_bivutiri.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423732/normal_5fec95c96c232.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386084/normal_5fdee39b84ae0.pdfIn PDF document text
    • https://kevavabine.weebly.com/uploads/1/3/1/4/131406582/ff45b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405419/normal_5fed7b0adcf4d.pdfIn PDF document text
    • https://cdn.sqhk.co/vomisape/hjxhcic/basepunivubod.pdfIn PDF document text
    • https://cdn.sqhk.co/boxumiza/7ox8jfa/4515353893.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481527/normal_5fc9f85130b04.pdfIn PDF document text
    • https://cdn.sqhk.co/jedepazisu/jfjdChf/ethnic_wear_online_shopping_websites_usa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424376/normal_5fd892d2ba07e.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/zalisujezajaje/administrative_court_judicial_review_guide_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/dabatisew/jevametusupokijezaxosoxi.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/relaxing_piano_ghibli_collection_sheet_music.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_off0000e791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE791 5732 bytes
SHA-256: 0cf16c3900fbe6e88ee24c3ad9c0ae2b4d999cd17a685b882f81dd0c500116a6
font_01_sfnt_off0000faf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF8 11248 bytes
SHA-256: fdcd76a41c227488dbf93cf94b592d237f2ced051452eab39f8241233dd554b5

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