Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ac3bf9a3340885…

MALICIOUS

PDF

68.9 KB Created: 2020-12-18 06:43:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f97802a46af86110a64ba099eb55bf98 SHA-1: 7728948b280e615d9cba94c16cf5acd8c5f21946 SHA-256: 38ac3bf9a3340885f6e031973d4fef3763291c6de4a982e968a5fb7fd498e97b
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL suggesting a lure for 'Kizi unblocked girl games'. Heuristics indicate a link farm and a ML classifier flagged the PDF as malicious. ClamAV also detected it as 'Pdf.Phishing.Trojan'. The presence of embedded JavaScript, though not fully analyzed here, suggests potential for malicious actions like downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffset.ru/123?utm_term=kizi+unblocked+girl+games
    • https://cdn-cms.f-static.net/uploads/4415292/normal_5fa2502a19a8a.pdf
    • https://nakigere.weebly.com/uploads/1/3/4/6/134608851/busoledirixo.pdf
    • https://cdn-cms.f-static.net/uploads/4367640/normal_5f8eaac5a81a2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc518c716f6d44b07d9a43f/t/5fd72e04d654060362e2125e/1607937541996/calcium_oxalate_in_plants_formation_and_function.pdf
    • https://static1.squarespace.com/static/5fc0c3aad26ff1194f72fc70/t/5fd05ec106d21916ed6be636/1607491265310/snake_switch_pro_controller_pc.pdf
    • https://static1.squarespace.com/static/5fc2ae5e1c8c7413143d62f6/t/5fc7a5da09f4d56e8f8bdd16/1606919644825/scariest_movies_on_shudder_october_2020.pdf
    • https://static1.squarespace.com/static/5fc27a90c14dfd36fefb8bc0/t/5fca9f87872fef1847c6eed8/1607114632204/football_soccer_agents_contacts.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd08a41491241adc4731f2/1606224037510/bebop_licks_piano.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4de7e6d49a06bb8848d4/1606372850853/reading_medication_labels_worksheet.pdf
    • https://s3.amazonaws.com/tapelu/womusirusanixorujelimog.pdf
    • https://s3.amazonaws.com/degisapemifa/76603932969.pdf
    • https://static1.squarespace.com/static/5fc2953ad26ff1194f7e808d/t/5fc3e5d81972c46e3c15e451/1606673880716/5426785187.pdf
    • https://static1.squarespace.com/static/5fc0f05df9866f3fd2d48fd4/t/5fc1bdb13c02f22b9d4e1e22/1606532530064/92740374769.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_off0000d048.bin
11232760794de694ba29346cbf0764d1591416032638e13c113b200c98949046		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD048 5480 bytes
font_01_sfnt_off0000e2dd.bin
e9a762f8fd3b03590d0816e0e3a6defc1cf73c6389635552fcd85dd2c4ba29fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DD 10444 bytes

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