Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ed7d8c1054cae3…

MALICIOUS

PDF

80.3 KB Created: 2021-07-12 21:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 748243497657481f2703afc796665bbd SHA-1: 2c3685d1b3e7e05690c48c3dc991d3b6786b2f57 SHA-256: b4ed7d8c1054cae3c543a4166f03e6c4359f98c7af1b0c895c5413acb7b34121
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains embedded URLs that likely serve as lures or redirect to malicious content. The presence of PDF-specific heuristics and the nature of the detection suggest an attempt to exploit PDF viewers or trick users into navigating to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8896

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/aauXj3bnHUA/square?utm_term=best+gloomhaven+starting+class
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec7aa7c8b0d544b6d6bca3/1626110631162/new_deal_federalism.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec7ee92de985067772fa1a/1626111721896/tinea_versicolor_for_years.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8ee670cbdad4d3503b155/1625878119269/naturopathic_medical_doctor.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec819254a52c186ce4c224/1626112402706/mutevavi.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec817ae94d7a30e0550ab0/1626112378447/single_handed_sailing.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec7b4fad4a1a22a3e693d1/1626110799599/meaning_of_indend.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e776f4a154b3187e2e24e4/1625782004111/coed_of_the_day.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_off0000dc00.bin
da6af94f4fec5f264df2ff979394b464198ed34948356491f0c503909709acb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC00 15756 bytes
font_01_sfnt_off00010489.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10489 16792 bytes
font_02_sfnt_off00011ca0.bin
fe3b8990d967321d9f36d54afe2d1cefbca55f37c3d0ac727e772903823f9567		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA0 10796 bytes

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