Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8f70d1cae46700…

MALICIOUS

PDF

80.7 KB Created: 2021-07-17 19:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 75f31e17a37ff2a3a529a3c630795c23 SHA-1: b4f0819ee24dc746a246d20b395dff11b3ac728c SHA-256: 5f8f70d1cae46700bdbbfd93d0a5d993c0ac63fb10c8575ab0b1a7d1a9a4d587
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 high risk score. It contains an embedded URI that points to a URL disguised as a benign feed, likely intended to redirect the user to a malicious site. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to deliver a payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://feedproxy.google.com/~r/sq/ugae/~3/UkUWPC8UKDU/square?utm_term=meaning+of+elements+of+communication
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f20ca9be244e0bce66cf90/1626475690215/systemic_functional_linguistics_ppt.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec8c72af807f1e15260750/1626115186270/dinozep.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f0afe2582eb60571432d2e/1626386402278/giregalovofadog.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e9090919a9f87deb71da3a/1625884937318/36322792876.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f005863db90d3c357039d8/1626342790224/70981166667.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8098f8f757b1ac4535a05/1625819535697/wojokerafisafa.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ed99da5d4dee687f483434/1626184154240/do_muzzles_hurt_dogs.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f22d2befed6b61d474cd78/1626484011337/3_types_of_chi_square_tests.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f20cf420c3155f11d302ce/1626475765023/label_a_compass_rose_with_cardinal_and_intermediate_directions.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f05b247fa2070f3197ae2a/1626364709038/common_core_sheets_equivalent_fractions.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee84f9b1f8b9564889b0a1/1626244345514/14791665570.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e95ea6b68d8f0f4bfa2da8/1625906854689/631075295.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f1bcc11141694c02dc5182/1626455233935/toughened_glass_price_6mm.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec798354a52c186ce3da48/1626110339291/capture_card_not_showing_up_in_obs.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_off0000db3c.bin
a3d690ef950d419db456c7540f6398500f89022ab31e0e09095aca14ae9e80b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3C 15900 bytes
font_01_sfnt_off00010417.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10417 16792 bytes
font_02_sfnt_off00011c2e.bin
051c5c33f21242c2fbc7ccd6504a3613544e2c9e6cfc2c005161f35418feabba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2E 10672 bytes

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