Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a4f6c323bb4aa7b…

MALICIOUS

PDF

76.2 KB Created: 2021-07-13 20:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 824d8b7fcff927b09c7c84c4e3c717c6 SHA-1: 840f0348ce8285c5c6ff46088e4cad66a62f19ca SHA-256: 3a4f6c323bb4aa7b9703d0d563a516fec9da51915fc8514e21dcf7863c6b0d89
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs, specifically one pointing to a feedproxy Google domain, suggests an attempt to redirect the user to a potentially harmful site. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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/~3/5JeRQhMeIYg/square?utm_term=free+adding+and+subtracting+fractions+worksheets
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e7b751bab06216133682ea/1625798481260/god_is_not_one_stephen_prothero.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e84d0d640b337e331bf6de/1625836814100/driver_booster_7.0_2_pro_key.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ed9b7d2d9f403b521177eb/1626184573234/graph_into_equation.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60edc221e635d716645ebcde/1626194465351/78683371875.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e8d6251058581513769b47/1625871909540/gibivekax.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e82338687a3d659a4eff05/1625826104929/xedetusopuguxemameremi.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60edac1754e5b71ae84fb917/1626188823287/15194048213.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e91db75fa2eb14b90b9551/1625890231989/noun_adjective_verb_meaning.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60edac9a5a30a704d0c170fb/1626188954528/city_of_austin_electronics_recycling.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_off0000c8a7.bin
8c6a2c5ee9fd0675baecf824c0c0a154860c6f1530ef3895b17dbff46e2da584
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A7 16172 bytes
font_01_sfnt_off0000f29c.bin
7441c9b2cc29cecb7f159f505ceb3fed8a22d1cb0286c0259cc27367cd5da9d7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF29C 11104 bytes
font_02_sfnt_off00010c4f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4F 16792 bytes