Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ac6bb0b745b74a2…

MALICIOUS

PDF

88.4 KB Created: 2021-07-12 21:40:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 950b396220ce0b45b7b9e151a453216e SHA-1: a51d222441d211ef8a96f8887d110e4730e300a6 SHA-256: 9ac6bb0b745b74a27634252a9c06d3b4ca8ff09a9f930cc848619c6f2babcef2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI that points to a URL which, while currently marked as benign, is indicative of a phishing lure. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the overall indicators point to a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8615

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/UkUWPC8UKDU/square?utm_term=class+8+english+chapter+2+question+answer
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec789cc217102653d50636/1626110108250/60009354804.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8c604fe2317389cedba93/1625867780457/environmental_impact_assessment_is_mandatory_under_which_act.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e93b31f492d21a0f6bafe3/1625897777741/sufokebomuxoxin.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8437d7facf136447eb294/1625834366111/the_agility_test_would_be_suitable_for_badminton.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e90ccddefa333328a9b7b6/1625885901486/bill_nye_living_and_nonliving_things.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8559662e77b6575d657f6/1625838998897/1159715979.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e7c04b7be683581ce14591/1625800779276/90603694708.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_off0000f48b.bin
d5a4d6658f96526f90e06a593695c20321726a7af43114e57e61c6f841d9305b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF48B 11344 bytes
font_01_sfnt_off00010f0a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0A 16792 bytes
font_02_sfnt_off0001271c.bin
f0e9be47d7d634d37660e63a8e195683da06d6fab492ee5a36721b2dc29dffa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1271C 17760 bytes

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