Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe7aa11990bf35b…

MALICIOUS

PDF

77.4 KB Created: 2021-03-09 10:59:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1629ccf0f474b55150585aef9106e585 SHA-1: e7490ba4dcd825389e07ef02e8e75a458cde12fe SHA-256: cfe7aa11990bf35b274f43352dff29b9908791ad97ff36d7ebbb6c4baff7c7f4
104 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains multiple embedded URLs and a heuristic firing for a visual download button, suggesting a social engineering lure. The presence of external URIs indicates an attempt to redirect the user to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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://crophysi.ru/123?utm_term=arabesque+1+piano+sheet
    • http://bit7.top/admin_login_css_template_freek4xmv.pdf
    • http://pumaguli.scienceontheweb.net/why_is_my_stock_temporarily_untradeable_robinhood.pdf
    • http://loneresel.mygamesonline.org/vizio_e601i-a3_wifi_not_working.pdf
    • http://vipimuxatomefi.medianewsonline.com/how_many_days_paternity_leave_in_us.pdf
    • http://jiwabozaxexe.mypressonline.com/96581389755.pdf
    • http://lamaded.mywebcommunity.org/visopesixuvugokibibig.pdf
    • http://fudazozotakaxal.mywebcommunity.org/32741272503.pdf
    • http://akmurzina.com/67510154076y47ke.pdf
    • http://zakewabo.scienceontheweb.net/15695561971.pdf
    • http://mebovaduzi.mywebcommunity.org/xugutu.pdf
    • http://jefevivavifax.scienceontheweb.net/dejotokijelukamegujamoli.pdf
    • http://ketaton.mywebcommunity.org/17542242571.pdf
    • http://buloshnaya.site/axiom_set_theoryhsyju.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ed0cc423-3551-4599-a07f-2a9f0a35829d/56937940283.pdf
    • https://uploads.strikinglycdn.com/files/de64068f-cf69-40c4-a85a-2e218a53b67b/nubuz.pdf
    • http://gototura.myartsonline.com/haircut_locations_open_near_me.pdf
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_fce773727c5c45f0a803989358341940.pdf?index=true
    • http://kewevagisugimuw.onlinewebshop.net/ncs_1500n_ral.pdf
    • https://uploads.strikinglycdn.com/files/ec10ddf6-3db1-405e-a51d-5dbb92d46a08/16138968161.pdf
    • https://uploads.strikinglycdn.com/files/a5e8ca6a-7c62-4041-82f5-e1723cbf2ef3/fifty_shades_of_grey_book_review_quora.pdf
    • https://uploads.strikinglycdn.com/files/5f0297c2-01bb-4997-8c48-b6dd60be4f46/22783680762.pdf
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_cc6a63a39a60444f98f78d5d0357c8cf.pdf?index=true
    • 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
    • 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_off0000d8a7.bin
16e413e31173aa7bec291ed0188990ae3d73979526774f5378eb26a6870fd1dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A7 5184 bytes
font_01_sfnt_off0000ea44.bin
96ad4209c7d63fd439b2cc0098529b77d0866cb65db818f20e7665d56b4edba5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA44 11728 bytes
font_02_sfnt_off000111dc.bin
9853a4a918762215dfcba51349555ff48d39e56332efe18e2f333ca30d8a5b61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111DC 16096 bytes

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