Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a6aec47410a781…

MALICIOUS

PDF

79.3 KB Created: 2021-03-30 18:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 426d58e5421a66bf7bedaa7775bf4eb9 SHA-1: 7aa129d4c61200ccceb33cbbd9479c186ac61993 SHA-256: f5a6aec47410a7816b2412fcd8132d0c74deb435520060a21d650ecb118c85b6
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The file is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The embedded URL and heuristic firings indicate a callback phishing or tech-support scam, aiming to trick the user into calling a fraudulent number. The document's content, though heavily obfuscated, likely serves as a lure to facilitate this scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/wix?keyword=joy+in+learning+glen+burnie
    • https://cdn-cms.f-static.net/uploads/4375340/normal_6046b104c9f38.pdf
    • http://gipogup.sportsontheweb.net/wesofomoxorodamad.pdf
    • http://pazefezos.mywebcommunity.org/disakamibutisovu.pdf
    • http://youtube-subscribes.com/43093462270o34mj.pdf
    • https://cdn-cms.f-static.net/uploads/4470014/normal_602d68c976626.pdf
    • https://rojanudase.weebly.com/uploads/1/3/0/9/130969060/4067640.pdf
    • http://idealslimitaly-official.site/37190960032xsy8l.pdf
    • http://bowuvudofi.scienceontheweb.net/descargar_guia_para_aprender_ingles.pdf
    • https://static.s123-cdn-static.com/uploads/4449603/normal_60009f2dc3d21.pdf
    • https://sowofinonapira.weebly.com/uploads/1/3/4/3/134361296/rekawupitewatu.pdf
    • https://gikejujeg.weebly.com/uploads/1/3/5/9/135966421/5cf4d0.pdf
    • https://kaxogabetex.weebly.com/uploads/1/3/4/3/134320086/9877740.pdf
    • http://calipshatngaccs1.xyz/outbreak_perfected_mission_guided1bxd.pdf
    • http://copyright-securityx.com/tipos_de_comunicacion_oral_panel6ve0y.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tofizo/bikexopow.pdf
    • https://uploads.strikinglycdn.com/files/7d06002b-13ca-4962-8ce9-da71f01c0f59/monikifeginujor.pdf
    • https://s3.amazonaws.com/retobifulipo/48747465502.pdf
    • https://s3.amazonaws.com/dukavunivifa/mokoxeba.pdf
    • https://uploads.strikinglycdn.com/files/bc446285-b407-41f7-ab78-df7b93f801d9/pedalera_zoom_a2.1u_precios.pdf
    • https://uploads.strikinglycdn.com/files/0335455a-f85b-4f5d-b5e0-16b3007bd327/why_is_my_nespresso_blinking_red_and_yellow.pdf
    • https://s3.amazonaws.com/firudegix/37437980936.pdf
    • https://uploads.strikinglycdn.com/files/f5fc8359-bb5f-4abc-a9ec-7417e72752ea/wukup.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_off0000f9d4.bin
b3f6236145e270f2fbf716b3168e71adc3e8c37d1d8bcc37f631740e1b2bf23d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D4 4908 bytes
font_01_sfnt_off00010aa1.bin
32cf671b540047e4fcde233e900b28bde533832d72b6c95c974ed615fd550aeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA1 10792 bytes

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