Malicious PDF — malware analysis report

Static analysis result for SHA-256 350965de237b2572…

MALICIOUS

PDF

87.0 KB Created: 2021-07-17 00:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6da3b0f1ca0ba1cb7552452cca9aed9d SHA-1: 0f9d3af950bd6e7af813da100784669f8f21b633 SHA-256: 350965de237b2572cf7adebeedc7a9247b1c788ddd43fc45ba21c0a0374a63ae
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ClamAV as a phishing trojan. While the document body is heavily obfuscated and unreadable, the presence of an embedded URI pointing to a Google Feedproxy URL, which in turn links to a USPS package limits page, suggests a social engineering lure. The ML classifier also flagged this PDF as malicious. No scripts were extracted, but the PDF structure and heuristics indicate a malicious intent, likely phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8239

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/CcIy6vlvkUk/square?utm_term=usps+first+class+package+limits
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f09c329882a91faebe1674/1626381363121/blurry_nights_quotes.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ed89aff84adf285bf40d95/1626180015994/naviwatadawuvajuban.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e9095d66be7e490f0ea5bf/1625885021575/13958675975.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60edf5a50229956bd136b609/1626207653707/cognitive_self_regulation_examples.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f146662606b657d3584f49/1626424935086/an_integrated_course_in_electrical_engineering_by_rk_rajput.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f0f632b238236d23308821/1626404402131/divogomobunekupob.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_off0000f21f.bin
19c3f14d8a0e13cd641e2cc41d43cba54194accaf07a847209d358fde86bba14		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF21F 10700 bytes
font_01_sfnt_off00010abb.bin
13bf42f02de63cbd68d03b3aefb628a69e7d127e33c55f5d1137bf4e48289ec8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABB 17248 bytes
font_02_sfnt_off00013803.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13803 16792 bytes

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