Malicious PDF — malware analysis report

Static analysis result for SHA-256 8223f752df576c8e…

MALICIOUS

PDF

88.6 KB Created: 2021-05-07 05:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: adb6e4273f4d3ff4f4e71e7326b6956d SHA-1: b8ae61277a4fbc56c8ad61645e807db8e83f6d11 SHA-256: 8223f752df576c8e4c89432e4a1eb9ae27b4ecc3ebacfc61d307bc9edf4e3662
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are disguised as downloadable files, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to trick users into downloading malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to exploit user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xezojetit.ru/strik?utm_term=download+matlab+2018a+for+linux
    • http://openchambre.xyz/what_are_the_foreign_policy_tools3zic4.pdf
    • https://ledijonag.weebly.com/uploads/1/3/4/6/134689342/f9ab6c8af3cd8.pdf
    • https://cdn.sqhk.co/xuluriwu/6ggigia/launcher_galaxy_s20_style_mod_apk.pdf
    • https://juputifewusa.weebly.com/uploads/1/3/4/4/134435955/lelabuzalupokuxetex.pdf
    • https://cdn.sqhk.co/lojumisebu/hjiaGNf/80358604359.pdf
    • https://cdn.sqhk.co/rurufimibiwe/b7iiif7/hd_wallpapers_1080p_iphone.pdf
    • http://pedron.fun/google_form_request_loginiefsa.pdf
    • https://cdn.sqhk.co/ribafesupuro/w4ejcTH/momupasoxa.pdf
    • https://kekuxepepave.weebly.com/uploads/1/3/0/7/130739312/2635933d67f4ea.pdf
    • https://cdn.sqhk.co/dodamewope/lfjc4Cm/40914615280.pdf
    • https://cdn.sqhk.co/kokijunuxagi/xiiO4ic/codingbat_java_answers_array_2.pdf
    • https://xexajuxeleseg.weebly.com/uploads/1/3/4/5/134592224/8befb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/futamo/jivegujutuzinur.pdf
    • https://s3.amazonaws.com/patotale/mathematical_statistics_1.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e423.bin
b29f9350a720d2da9dc50567d08c4a82684db1fcb28a47e3a5788345b392d808		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE423 6744 bytes
font_01_sfnt_off0000f508.bin
12c9590fbfa6bb0652c115cb4a5ce869bfcd719ee14bf82c8478b3a36df0fb20		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF508 5456 bytes
font_02_sfnt_off00010796.bin
7ff8fcb56fa37a1b102fe648f86122d9a77ebab4ef93383f795e634ccf5cfeac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10796 11884 bytes
font_03_sfnt_off00013084.bin
a8a99e61f0dcc39bdebdb55e08eb025040dd1d9add743fdb525387d7be222ed7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13084 16312 bytes
font_04_sfnt_off00014644.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14644 4324 bytes

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