Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac15bc7673eca6f7…

MALICIOUS

PDF

106.7 KB Created: 2021-07-18 09:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7c0251d61c5a4ea60f38bab092f1e03d SHA-1: c7a0ac035b7951753fac925661f4037887f6bb90 SHA-256: ac15bc7673eca6f7f4139e16dbcf7afe1416abc0c4d875576cc6cc64fcf5c920
96 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and also received a high score from an ML classifier, strongly suggesting malicious intent. The presence of embedded objects and the nature of the detection point towards an exploit being used to execute a payload, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7979

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://feedproxy.google.com/~r/razvivatel/yapz/~3/AG-UZpNbJGc/square?utm_term=tpd+own+occupation
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e91c7a5ebba154a8fc29c0/1625889915019/how_to_make_someone_think_about_you_without_talking_to_them.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60f1718d9b6f23611959d0f1/1626435981474/the_sum_of_any_two_sides_of_an_isosceles_triangle.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec887c6ad76c097490beef/1626114172919/real_life_situation_tok_examples.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60eda758c5e0b1320e354e4c/1626187608748/is_it_good_to_take_naps_during_the_day.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e945a52dabf272355586b5/1625900453674/zopuxifabepoxoridatilewo.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f0613e58a4fb13da3355b0/1626366270569/23454544404.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec86cb7e5cd11affcd87d9/1626113739604/fallout_76_classical_radio_playlist.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_off00013eee.bin
92f0c09e504030f4ecc4f6f4c7ec3b057c81a27827735b63ecc56b131872716a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13EEE 18440 bytes
font_01_sfnt_off00017012.bin
b5b0ecf90cd473de33efb5fcb2d982ac52b0e163b701ec73f7b31a8e4023dbf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17012 10208 bytes
font_02_sfnt_off00018722.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18722 16792 bytes

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