Malicious PDF — malware analysis report

Static analysis result for SHA-256 83bea2028419178d…

MALICIOUS

PDF

75.7 KB Created: 2021-07-15 10:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a9c64df084d3cc98be35d9319ac1979e SHA-1: 9d7c5596578cce8c7687380419e2d26137e2d647 SHA-256: 83bea2028419178d502696a9cdbf37f5cf7e973da9a376ca665dd54284f2805d
104 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV specifically identifying it as a phishing trojan. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to direct the user to external resources. The 'SE_DOWNLOAD_BUTTON' heuristic indicates a potential lure for downloading further content, which is consistent with a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9680

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
  • 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://feedproxy.google.com/~r/razvivatel/yapz/~3/0YvHz_IItD0/square?utm_term=how+to+sketch
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60eca8bc8c19ad4998de8a46/1626122428348/place_to_space_migrating_to_ebusiness_models.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e7ee61d0799e4214c132aa/1625812577438/55563973632.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec7c3a54a52c186ce42f61/1626111034585/i_want_to_see_you_in_spanish.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ee131bf6c772366d2ab7b2/1626215195309/past_perfect_continuous_have.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60efca7e4980ba6b3b6c9a5b/1626327679074/woguwiwekisosokaguj.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60efdf2f5d627c4551e10c3f/1626332975308/presidential_debate_2020_questions_and_answers.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee74ac39b82603386d6d20/1626240172231/earth_in_the_beginning_of_time.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60edd0228443ee2c892e5411/1626198050708/design_of_singly_reinforced_beam_by_working_stress_method.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_off0000c983.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC983 16792 bytes
font_01_sfnt_off0000e195.bin
91922be6c1a0bfe411a45d9cf98cabbec3b0a1432b96977641921f6c77dbde9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE195 16136 bytes
font_02_sfnt_off00010b5c.bin
1ca9a140bd41e81f8a3f541abc034b43db7365e81691f6261cc8fcf5b619e5ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5C 9992 bytes

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