Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ca4820f52bc18cc…

MALICIOUS

PDF

68.2 KB Created: 2021-03-10 19:54:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b6bef9ebc59f6065a10e2b50129e663 SHA-1: 9ebe291c15031438d859edf2c8579bde8a73122e SHA-256: 5ca4820f52bc18cc673c19dba78c790685b6a50a7e3e3cabec5ceb68fcde364b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are part of a link farm designed to direct users to potentially malicious content. The embedded URL and the document body suggest a lure related to movie downloads, which is a common tactic for phishing or malware distribution. The ClamAV detection and ML classifier further indicate malicious intent.

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://nipisod.ru/123?utm_term=ma+pass+full+movie++720p+khatrimaza
    • https://cdn.sqhk.co/xasurila/ajfzrDC/42336336720.pdf
    • https://miwidikanizi.weebly.com/uploads/1/3/4/0/134016908/f38f243de3e18.pdf
    • https://cdn.sqhk.co/momujolo/hifCAja/run_race_3d_apk_ios.pdf
    • http://najezeb.22web.org/powerpoint_certificate_template.pdf
    • https://xagigerabep.weebly.com/uploads/1/3/1/4/131483632/sufipelikinasos.pdf
    • https://cdn.sqhk.co/vejuwami/ojahjUt/53116872753.pdf
    • https://cdn.sqhk.co/ditutafewaw/fHYqgeF/dujexis.pdf
    • https://mizefowoxeze.weebly.com/uploads/1/3/4/4/134485365/niviwigib.pdf
    • https://cdn.sqhk.co/nemoludajedu/OgdZFgd/equalizer_foot_pro_massager.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/novifamigot/bilking_india.pdf
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_4e164da6a89c4f63ad11f852551a1704.pdf?index=true
    • https://s3.amazonaws.com/nemafu/57597692363.pdf
    • https://48e4e0df-78ce-4736-8797-27735e68dc67.filesusr.com/ugd/f3b179_da5f72d3c294447cb72b882b9b13abbd.pdf?index=true
    • https://s3.amazonaws.com/mulerux/gradient_powerpoint_template.pdf
    • https://s3.amazonaws.com/voxazedisula/33212064215.pdf
    • https://ac263381-fdad-4fda-ae78-6df6d71032d6.filesusr.com/ugd/25c42e_ee40ac50a10b4c63a0c96902e415de82.pdf?index=true
    • https://d62ff7d9-aefc-4ab8-8cdf-af38868aea16.filesusr.com/ugd/54b9a1_05efea06cb9247efbc63bbdc71b5c8ef.pdf?index=true
    • http://bigagapafobari.rf.gd/what_is_farsighted_mean.pdf
    • 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_off0000cbba.bin
1a62f7f20e00427e2eb88a2447ff5725cf7c54179df7a44ed583bd112169a2a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBA 5676 bytes
font_01_sfnt_off0000defd.bin
8ec7ea14263c22f111a98500090d4a77981a232e263335ca807b081e3a0f5324		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFD 10748 bytes

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