Malicious PDF — malware analysis report

Static analysis result for SHA-256 657eb3e80e376873…

MALICIOUS

PDF

71.8 KB Created: 2021-01-06 09:57:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8a132d48e04a8a33fc2a96b5842d3701 SHA-1: eeb4cee6afcb0194ea3d65d27c042899c3f7fdd7 SHA-256: 657eb3e80e3768732ac813709b0361e5286bdd92ab3148182c01ccec2092e1be
144 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The sample was flagged by a machine learning classifier and ClamAV as malicious. It contains heuristics indicating an external URI and a lure to execute commands via the clipboard. The document body, though heavily obfuscated, suggests a technical pretext related to decompiling and recompiling APKs, which is likely a social engineering tactic to trick the user into executing malicious commands.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://trafficel.ru/123?utm_term=decompile+and+recompile+apk+ubuntu PDF link annotation
    • https://nojezedefefowas.weebly.com/uploads/1/3/4/7/134762002/28d590568.pdfIn PDF document text
    • https://fukagopesuzidad.weebly.com/uploads/1/3/1/3/131381553/cf79a.pdfIn PDF document text
    • https://lirabofopexile.weebly.com/uploads/1/3/4/3/134356775/vokigabamu_rijonuboronake_laderogejiwo.pdfIn PDF document text
    • https://linusakeziri.weebly.com/uploads/1/3/4/7/134747074/senivazolozer_rubufel_vorixilojis_xarojumazak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452173/normal_5fb4eae6499ee.pdfIn PDF document text
    • https://weritudasokapo.weebly.com/uploads/1/3/4/4/134494226/minut.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/06369a2b-87ca-4abc-891f-da50394132ec/15636694067.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/225415db-a188-4b09-be6c-8b5be54da7dc/lizogowakiviweromadolaze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9731c9dd-d09d-485b-82b2-683a68708ee4/trisodium_phosphate_food_grade_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a68475a-0d25-406e-a0c4-82face1972e8/free_printable_thirty_one_order_forms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc40e753-8a34-46d8-bc7a-9d29d3129b61/climatogram_of_the_desert.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_off0000d80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80E 5244 bytes
SHA-256: fc4a71196eabd6eec7720100044f655b1c4b2c593bba0b406ad94cd7463fb15b
font_01_sfnt_off0000e9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C8 11528 bytes
SHA-256: 37cf31e010a7408f997c41d49a6549bad682da3ca45a38d2d1a729822394ed42

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