Malicious PDF — malware analysis report

Static analysis result for SHA-256 4325581c574f83a6…

MALICIOUS

PDF

84.5 KB Created: 2021-03-25 02:02:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99e1e4817eee682fda6de07cbb78cc8a SHA-1: 24497f57ab3b5920d17b77fb7efed964b3669400 SHA-256: 4325581c574f83a6b5a69608cf7a2786753c2fedf42320ff97d4f891642b20a7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of a large number of external links, including one to `jumiwimov.ru`, suggests a link farm or phishing attempt. The document body, though heavily obfuscated, contains metadata related to PDF generation, indicating it's likely a lure document. The primary attack vector appears to be directing users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/award?keyword=atropina+pdf+2020
    • https://rezezeveg.weebly.com/uploads/1/3/1/8/131871466/jipawavada.pdf
    • https://cdn.sqhk.co/pagozixupezi/jijshcX/piano_tiles_with_anime_music.pdf
    • https://sivavodafewe.weebly.com/uploads/1/3/4/4/134484486/786c0bcc2.pdf
    • https://cdn.sqhk.co/siripeka/eKifM8i/riwajowafulokunef.pdf
    • https://rulotukipaka.weebly.com/uploads/1/3/0/7/130776525/raxanemoxudos.pdf
    • https://vujajewuriwox.weebly.com/uploads/1/3/5/3/135387523/gunemuregew.pdf
    • https://cdn-cms.f-static.net/uploads/4471688/normal_603020137f19c.pdf
    • https://static.s123-cdn-static.com/uploads/4452385/normal_5ffd679db8038.pdf
    • https://sazaburesifug.weebly.com/uploads/1/3/4/2/134265765/6781337.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zarusegibitumet/waterpik_whitening_water_flosser_refill_tablets_wt-30_uk.pdf
    • https://681956c7-2c57-495f-b996-d04b50c745b0.filesusr.com/ugd/907d98_ae7c01a06dde4507bfed0bf27f5c748c.pdf?index=true
    • https://da550aaf-34ae-4f9b-ad82-7836b82beebe.filesusr.com/ugd/a203e6_09e62caaee404a2baf98e32cd735cdec.pdf?index=true
    • https://ac4cd5cf-e861-4b1b-a585-e47049f737a6.filesusr.com/ugd/843280_7cff374e2284474c9242b324907b72b5.pdf?index=true
    • https://s3.amazonaws.com/tojazudibumogab/xufalivumowofa.pdf
    • https://s3.amazonaws.com/vezumobigodub/78910189220.pdf
    • https://s3.amazonaws.com/goviwigax/9948528271.pdf
    • https://s3.amazonaws.com/salade/aparichitudu_telugu_movie_full.pdf
    • https://s3.amazonaws.com/tipikaxe/45454464853.pdf
    • https://s3.amazonaws.com/sezebepit/rexinufajabekutamuzuxo.pdf
    • https://28a90398-13b1-4b58-b54c-ed045a6bddf2.filesusr.com/ugd/7e9e1f_f8ed0d07a41d41cda0de72ad117a7c93.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109b1.bin
52e3527ea987ae79ba22e87f94a8ab2b6a71a439f1b4c914ffd7669e5af3e239		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109B1 5088 bytes
font_01_sfnt_off00011b10.bin
b640ed07c267b76c110ec97fe2b86c8b922a9bd4e2593ccaf9a01da7e62d1ea5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B10 12956 bytes

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