Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe9482f422eacc0…

MALICIOUS

PDF

77.2 KB Created: 2022-05-28 18:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2022-07-15
MD5: 406472f74399ccdd5cc4f92ae1e5a270 SHA-1: 7501bd103ae1d9b9b3c238759b642fd512f120b2 SHA-256: cfe9482f422eacc0a788856a028a04276dbc78fd216f2f395a79ea3543d674a0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. An external URI heuristic identified a link within the document body that leads to a suspicious URL. This URL is presented as a physics book answer key, a common lure for phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • 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://sunuf.co.za/YmrXLWy8?keyword=spinning%20mass%20on%20a%20spring%20mastering%20physics%20book%20answers%20key%20pdf
    • https://lijagetasigu.weebly.com/uploads/1/4/1/6/141604956/5830975.pdf
    • https://pepibugogik.weebly.com/uploads/1/3/1/0/131069762/8f24a.pdf
    • http://indyztyle.com/ckfinder/userfiles/files/supovovise.pdf
    • https://kudoxere.weebly.com/uploads/1/3/4/5/134591480/20dded.pdf
    • http://helppakistan.nl/cmsimages/file/28465952371.pdf
    • http://tcgardening.com/userfiles/file/2022021612512673499.pdf
    • https://xamotufa.weebly.com/uploads/1/4/1/6/141680470/zubezamutimozetuwa.pdf
    • https://gejixivipoza.weebly.com/uploads/1/3/0/9/130969358/3c326864ed3.pdf
    • https://kikunuwip.weebly.com/uploads/1/3/4/6/134687028/7597388.pdf
    • https://dogirewepa.weebly.com/uploads/1/3/1/8/131856222/daxikig.pdf
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/sezoxudawomu.pdf
    • https://gebijakirapasu.weebly.com/uploads/1/4/1/6/141632634/kesozikudolu-sazafevogulire-kiriz-befisudeziwu.pdf
    • http://newbiesites.com/userfiles/file/tibebavavaludeku.pdf
    • https://jomaredavox.weebly.com/uploads/1/3/2/3/132302995/5022427.pdf
    • https://residencialparquenorte.es/kcfinder/upload/images/files/rawexo.pdf
    • https://pefupofavuxugo.weebly.com/uploads/1/4/1/2/141249676/bonolixidiposupegum.pdf
    • http://bellina.pl/userfiles/file/jirajobimiduwup.pdf
    • http://aodaibooking.com/FileData/ckfinder/files/20220426_7ED50BC1FE53A233.pdf
    • https://jobs24live.com/justjava/web/images/fck/file/31719682280.pdf
    • http://borik.customreal.sk/data/files/natuzosunovuv.pdf
    • https://efficimm.fr/userfiles/files/19878513835.pdf
    • https://kezozebajex.weebly.com/uploads/1/3/4/2/134265808/8063128.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5b3.bin
e641cf46af76e32d289c2c92b945ee5a88ad33e4349cb13034775f2a5088997f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B3 11528 bytes
font_01_sfnt_off0000e07a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE07A 16792 bytes
font_02_sfnt_off0000f88c.bin
01e9a2fdb1152cbb95931cbafa90d48e780b2c9c19cef01c1e4f05135d99263c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF88C 17384 bytes

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