Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc5de27c9ea033d5…

MALICIOUS

PDF

85.8 KB Created: 2021-07-13 16:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 585a2e09279f6033bfa0a7cf336f3fe3 SHA-1: bda44be035141bec7481e30cc42fcd0c21f7b03f SHA-256: fc5de27c9ea033d5fd773b0597f6f10e552537993f9338d36fedeff16b203f0e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests a potential phishing or payload delivery mechanism. The PDF structure and embedded artifacts do not reveal specific scripting languages, but the overall context points to a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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/sq/ugae/~3/S-4CHg4Qmwo/square?utm_term=hard+anatomy+questions+and+answers
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8256c5c1b84600341bdf9/1625826669032/word_cookies_daily_puzzle_april_16_2021.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8e861defa333328a7b982/1625876577138/strike_the_blood_episode_1_english_dubbed_kissanime.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ed89a5c439f8287166887d/1626180006211/bemozetomexowos.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ed8d216be96a4ec40be101/1626180897220/12044419916.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e91c26c91b61347ea37df1/1625889830997/science_fiction_double_feature_tab.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e773de4b2b7f268b96156a/1625781215028/pdf_cooling_tower.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8c07e4be6b65fb4b0bacd/1625866366418/linear_equations_questions.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec7d9bd0153e73bf8b2c58/1626111387335/nasizifisibomeb.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ecb2fb4b894625970f90e9/1626125051908/rapeseed_and_canola.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec7b0e7e5cd11affcc3c2f/1626110734261/charging_by_conduction_and_grounding_answers.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_off0000edc8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC8 16792 bytes
font_01_sfnt_off000105df.bin
3861dad6df4f8cdb356d8e256c9f5d3ab62644e1c158facd6f5cb220505d3b5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105DF 10800 bytes
font_02_sfnt_off00011e90.bin
301e58245bf1aedfc2cf1c085e823e33b3e8912b51f4f740287cdf67d0943dbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E90 17032 bytes

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