Malicious PDF — malware analysis report

Static analysis result for SHA-256 172bfd382d8e6dd4…

MALICIOUS

PDF

75.7 KB Created: 2021-07-14 02:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 439426ffc16bb424be15e826279c40cb SHA-1: 6f1cb76d7f1926bdbffb31814ae0019290de783d SHA-256: 172bfd382d8e6dd4a47d6325178c0ad5a18d253f60cb7c5a74ad26c07c2ab4fe
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains embedded URLs, one of which is a Google feedproxy URL that resolves to a benign Squarespace page, but the overall context suggests a phishing or credential harvesting attempt due to the 'urgency/deadline' heuristic. No scripts were extracted, but the PDF structure and heuristics point towards a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/qI_NY8u86tA/square?utm_term=ticks+on+dogs+in+florida
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec86705f604029b991d3f5/1626113648538/books_on_business_administration.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ed26a364a4563c8f7a80c0/1626154659997/cooking_cow_heart.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ee1b88b1dcdf258da54b3e/1626217352831/87644066391.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ed9ee2cd5f69124b414d39/1626185442289/44310997328.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e944f358c6623f038375ba/1625900276106/kefuten.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e875e33bef1c134bd4bde9/1625847268027/causes_of_enlarged_prostate_gland.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e822751d61f435cefaca97/1625825909150/822863543.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8d5778c0097185606fda9/1625871735179/sonic_adventure_dx_2004_pc_download.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec9ccd9c874e71424a536c/1626119373315/guluxafedi.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e78f02d93aeb546a0ff998/1625788162819/if_there_was_vs_if_there_were.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_off0000c970.bin
eb6ad9b12d0fb1e7dc966ac22b8eb32b3d77bdd69b14455b991cf1172ad519ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC970 10476 bytes
font_01_sfnt_off0000e11a.bin
b6b5d1a9dbf35c129e361f2e87358f3afce84f655b7e1ae086dc1ddcfbd66275		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE11A 16108 bytes
font_02_sfnt_off00010ac0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC0 16792 bytes

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