Malicious PDF — malware analysis report

Static analysis result for SHA-256 92d57f208d3d9d73…

MALICIOUS

PDF

67.4 KB Created: 2020-12-14 16:46:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f1f449dadc54e87662d5ac5a5740ece9 SHA-1: 3b1b6ad0d3be4d089d9f6b07a273a9f25343a729 SHA-256: 92d57f208d3d9d733e4eeb03eca1163dd53f9006f1472bfeb980de20a6b68d07
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an embedded URL pointing to a suspicious domain, likely intended to trick the user into downloading a payload under the guise of an 'answer key'. The document body, though heavily obfuscated, suggests a lure related to educational material.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/123?utm_term=lesson+8+adjectives+grammar+answer+key PDF link annotation
    • https://jekuwetif.weebly.com/uploads/1/3/4/8/134887180/36b65216dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505159/normal_5fb9e61ca5df5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372735/normal_5fb582cb51370.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409628/normal_5fb4b89e861dc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a2b5e5f-0619-45b8-bc1a-d98d91881e17/gidavekuxa.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f1b0084698658e5e73ac/t/5fc23bb63f75b166431e018d/1606564791679/self_laminating_sheets_staples.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/most_ed_rpg_android_games.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8d1a396-100e-4588-aa6a-fb085f8ecf80/ms_pappas_506.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/46794332772.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ce26b97-1422-4add-be78-258db5f0df03/mofokane.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe3aba31-3f45-45c3-8639-c07437fc54d6/high_five_ghost_funko_pop.pdfIn PDF document text
    • https://s3.amazonaws.com/jevuxozazebazug/kiloxekukemaxiwut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/542bbf6e-a244-4b78-bc24-dc924315b88d/ac_odyssey_setting_the_stage.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/rumazamibada.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC729 5756 bytes
SHA-256: 075e22eb74ceb2f7005c52c69126055f0a572c87bd3c689a0dc7db6c4851579f
font_01_sfnt_off0000dad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD9 10668 bytes
SHA-256: 32b1be279f1a45fe5dfe387795b48ebe3ebf8baadc146065ee668ec66bd753ea

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