Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce8d67d9045059d7…

MALICIOUS

PDF

87.8 KB Created: 2021-07-16 15:39:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a30cc9b132890fad3eaf3a5a3db75fd SHA-1: 2e0cff1eb52b1557c15a7b73222aaca67697e025 SHA-256: ce8d67d9045059d7447002b9ac7098a5f0219bea8b2d6f8c41832694d4165a9f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with a critical heuristic firing for ClamAV detection. An external URI pointing to 'synerhu.ru' was extracted, which is likely malicious. The PDF structure and embedded content suggest an attempt to trick the user into visiting this URL, possibly for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9526

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://synerhu.ru/square?utm_term=section+3+conservation+of+energy+answer+key
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f09edf6f60a93de03fc1c4/1626382047879/74756358733.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f162f05554232196bf1e41/1626432241317/sentence_that_uses_all_the_letters_of_the_alphabet.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e94fb8f4fe78435a3c2045/1625903032715/12710250445.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8192dd93aeb546a17090e/1625823533738/53400008641.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f055a76e01a54b0d29aedd/1626363303991/symbols_used_in_engineering_drawing.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60edbdde4c056a31b817cef8/1626193374663/how_to_store_rice_flour.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f04474b3de5a36b12a9efa/1626358900854/2978787746.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e7eb8252059f1ec1e4dd9d/1625811842489/fuvumofazulag.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_off0000f1ef.bin
cf760fc995d49eb602db81b623b8e77945785f20bb95039feaf0695cae73140d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EF 17736 bytes
font_01_sfnt_off000120dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120DD 16792 bytes
font_02_sfnt_off000138f4.bin
76a03d137b4a6394587b3641321a4ae4dc092ac9495ca357ead9d709e65a12ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138F4 11068 bytes

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