Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d0a1b3708c47403…

MALICIOUS

PDF

75.6 KB Created: 2021-07-13 17:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d5f42c1580f8e59b49b8a4e03ff0e8d1 SHA-1: a50d219ecc15f93da9b03b3a177e3744a2b7c3cf SHA-256: 5d0a1b3708c47403dab43d24c1f6ce9bf06645b35fd4e5ed16b44f96143bcd65
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains an embedded URL that directs users to a site offering a 'video maker apk for android', which is a common lure for phishing or malware. ClamAV detection and ML classification confirm the malicious nature of the PDF. No scripts were extracted, but the presence of a malicious URL strongly suggests an attempt to trick the user into downloading a malicious payload or visiting a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7390

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/square?utm_term=video+maker+apk+for+android
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7fd4a1873c46ac93af3fa/1625816394517/spanish_tenses_review.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec86a5760c9e2bcf434532/1626113701937/aspartame_is_it_bad_for_you.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60eca4619a1cf201f807f617/1626121314112/zunijisaxemotorugufip.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ed9be8c8cbd011b90bb686/1626184681174/digumaxil.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://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_off0000c98c.bin
01eddf0e7b86e169a9009906a2bb921128969e56f17f9c4bd0da7d55bbea4acc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC98C 10408 bytes
font_01_sfnt_off0000e107.bin
275d0987da5a6cf9a7788e0dc92c34f8e202daf920935986782d6345072d74d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE107 16100 bytes
font_02_sfnt_off00010a97.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A97 16792 bytes

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