Malicious PDF — malware analysis report

Static analysis result for SHA-256 5310133bfb4cadec…

MALICIOUS

PDF

72.9 KB Created: 2021-05-31 21:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61db1e9f2a4b103ae95442dd020248d3 SHA-1: 1ce45ed68d25f8beabc49573b44415cd4938b101 SHA-256: 5310133bfb4cadec5613b9eb6b3430b3b46e04b7909b3a304557a4828ed45f6d
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution T1190 Exploit Public-Facing Application

The file is a PDF document flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in tech-support scams and callback phishing. While no scripts were extracted, the PDF structure and embedded URL suggest an attempt to exploit vulnerabilities or deliver a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://krisoc.ru/pbw?utm_term=eduardo+galeano+cerrado+por+futbol+pdf
    • https://cdn-cms.f-static.net/uploads/4413000/normal_606c6247551bb.pdf
    • https://cdn-cms.f-static.net/uploads/4377400/normal_60262eca6872f.pdf
    • https://cdn-cms.f-static.net/uploads/4455374/normal_5fd96ab6f10b4.pdf
    • https://cdn-cms.f-static.net/uploads/4367903/normal_603f95d45bcfa.pdf
    • https://cdn-cms.f-static.net/uploads/4477181/normal_6024c743143be.pdf
    • https://static.s123-cdn-static-d.com/uploads/4467975/normal_60b0770a0b58f.pdf
    • https://cdn-cms.f-static.net/uploads/4367951/normal_601646c985adc.pdf
    • https://static.s123-cdn-static.com/uploads/4369310/normal_5ff041e66aae0.pdf
    • https://cdn-cms.f-static.net/uploads/4406785/normal_60505739e3ebd.pdf
    • https://cdn-cms.f-static.net/uploads/4371023/normal_606b6be7c7885.pdf
    • https://static.s123-cdn-static.com/uploads/4407087/normal_5fecd208b5f19.pdf
    • https://static.s123-cdn-static.com/uploads/4495974/normal_5fdebb7f9ba15.pdf
    • https://cdn-cms.f-static.net/uploads/4375886/normal_601ef2dc55015.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://funinupun.pbworks.com/f/airplay_app_android_tv_box.pdf
    • http://lekuzax.pbworks.com/f/gelebonegulufowatuwaf.pdf
    • http://pezeliv.pbworks.com/w/file/fetch/144423807/25493864332.pdf
    • http://lekipirunezi.pbworks.com/f/can_you_have_a_venmo_account_without_a_phone_number.pdf
    • http://kufujibumufa.pbworks.com/w/file/fetch/144411645/how_to_connect_vizio_wireless_sound_bar.pdf
    • http://sonopewobu.pbworks.com/w/file/fetch/144419889/what_do_the_numbers_mean_on_italian_pottery.pdf
    • http://zopujoxobug.pbworks.com/f/85870395769.pdf
    • http://jesababa.pbworks.com/w/file/fetch/144414729/types_of_register_in_english_language.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_off0000db02.bin
133d333c0f594340ee11152e65e7a668e16da369b01c813e0a769f49ba26d3ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB02 5240 bytes
font_01_sfnt_off0000ece8.bin
81a82bdcd3ff7176b02305414b61494c70e2765907842724083bf9a95da09238		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECE8 13176 bytes

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