Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35acce70b7536fe…

MALICIOUS

PDF

79.9 KB Created: 2021-03-16 20:59:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d60b99d3cdec66f959278bea1609df84 SHA-1: 4b1f6980a9a509325781374fa397f9cdf447de07 SHA-256: f35acce70b7536fee2b3b955ef8990257c6866ebb7ef549a841c58f75935ef92
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, and one specific URL pointing to a driver download. This suggests the document is designed to redirect users to malicious websites, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/strik?utm_term=elm327+mini+bluetooth+driver+windows+10
    • https://cdn-cms.f-static.net/uploads/4478414/normal_603d27e63121c.pdf
    • http://reawolt.online/the_unwanteds_serieslxfif.pdf
    • https://cdn-cms.f-static.net/uploads/4485823/normal_600a9eeb71a3d.pdf
    • https://nerilumasufut.weebly.com/uploads/1/3/1/4/131437044/5f89f6d.pdf
    • https://static.s123-cdn-static.com/uploads/4494431/normal_6000c8c0f34dc.pdf
    • https://cdn-cms.f-static.net/uploads/4458837/normal_602adda635a7d.pdf
    • https://static.s123-cdn-static.com/uploads/4494140/normal_5ff5c58a666e1.pdf
    • https://cdn.sqhk.co/remimidotomi/Ul0jijg/edit_photos_and_videos_on_iphone.pdf
    • https://pudiwozi.weebly.com/uploads/1/3/4/5/134510484/jowezimipug.pdf
    • https://lulujazopo.weebly.com/uploads/1/3/4/7/134769354/juzasawuzeser.pdf
    • https://larezonisu.weebly.com/uploads/1/3/0/7/130738889/6871597.pdf
    • https://wurilulisewanid.weebly.com/uploads/1/3/4/7/134728532/34899.pdf
    • https://cdn.sqhk.co/rijizedot/QGHyAjh/top_hashtags_today_2020.pdf
    • https://cdn.sqhk.co/rabuvimi/khanlV3/crazy_s_foosball_challenge.pdf
    • https://cdn.sqhk.co/gusisezepemu/fijUThi/xarelokugusa.pdf
    • https://peninugeba.weebly.com/uploads/1/3/4/6/134666339/sotunazuwatafu.pdf
    • https://sijupazijeter.weebly.com/uploads/1/3/4/6/134639914/nakizezu.pdf
    • https://cdn.sqhk.co/duxajoje/5wgj2hh/zakidinup.pdf
    • https://wirafoxojobukof.weebly.com/uploads/1/3/4/6/134608935/nivoso.pdf
    • http://aycotoro0.xyz/how_to_become_cia_certifieds9agz.pdf
    • https://podisubegipuvu.weebly.com/uploads/1/3/0/7/130739029/xeduvegamogogaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb4e.bin
e67978520b030a4faa8f5ee9c28b5bb807b9e646a0ff06a816abf4d15e079519		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4E 5556 bytes
font_01_sfnt_off0000fe1b.bin
d5d21087df1bf33c4c8e00c5dd10aac8e4450bc7bd47237688e88ad79974fd08		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1B 11040 bytes
font_02_sfnt_off000123f5.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123F5 4324 bytes

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