Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5060c5fad7a1980…

MALICIOUS

PDF

78.1 KB Created: 2021-07-20 03:36:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9cb3320a292e48fbafa2c3ad4fbda119 SHA-1: 3a687b817d8900bfed91b7980326bac72143009b SHA-256: f5060c5fad7a1980f7486d1c321457b872a28af7ac16c6e4b57fde5f671f4e59
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that was flagged by a machine learning classifier and ClamAV as malicious. It contains embedded URLs, one of which points to a seemingly benign Squarespace domain, but the overall context suggests a phishing attempt. No scripts were extracted, but the presence of embedded URLs and the ML/ClamAV detections indicate a likely attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8678

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/AG-UZpNbJGc/square?utm_term=nutrition+in+french+onion+soup
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e7e85f97884458c9a240e3/1625811039814/contrast_stretching_algorithm.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60eff0fb34da7a51e3f3383d/1626337531682/15660935630.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f4cd3ad68f3225906a9409/1626656058266/gatadelolim.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee85b1e7148d06bc74cfba/1626244529835/create_from_php.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f6168a1cd2fa68876e8b1f/1626740362349/if_i_told_you_i_liked_your_body_would_you_hold_it_against_me.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60edcfc5cc8e436e4663f829/1626197957629/decimal_to_binary_converter_with_steps.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f43c3629712869f06f8dbc/1626618934489/nugajuzuzunonuviru.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_off0000d023.bin
3a1521b89a5386130e8f1671d51db0b943c7e3a4607c8346cb87ebfb6da48bed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD023 10444 bytes
font_01_sfnt_off0000e7ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CE 16792 bytes
font_02_sfnt_off0000ffe0.bin
249220efdd41e04b46450dcce949faa26499d4dc5b18d6248f98f743bf3f67db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE0 16840 bytes

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