Malicious PDF — malware analysis report

Static analysis result for SHA-256 c010b1156288830f…

MALICIOUS

PDF

88.3 KB Created: 2021-07-12 21:39:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 61d8799a6734fcc3a31c8d5ec810c804 SHA-1: 3f679b6097a0d625560bf99b12cf20b32fd4ebbb SHA-256: c010b1156288830f442df210e39913780451482c9ed3bf0edd90434e3203ae33
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of an embedded URI pointing to a download link suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attack pattern involving social engineering to trick users into accessing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8790

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/razvivatel/yapz/~3/AG-UZpNbJGc/square?utm_term=hsk+2+workbook+answers+pdf+free+download
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e95bf96e267257943c9414/1625906169343/75369098684.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e76d5280ff2057504543a1/1625779538563/1_kw_equal_to_hp.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec7f897a1add4dee1f18d6/1626111881298/gefarinopomisidexu.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e781392dff2e38461daacf/1625784633871/bavikoz.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8135b52059f1ec1e66dce/1625822043221/pugupometoralim.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e91b0db67368755967999d/1625889549887/kaxosikotavarisevanipurel.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e798c6bab0621613348923/1625790662656/heat_travels_through_liquids_and_gases_by.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_off0000f4a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A7 16792 bytes
font_01_sfnt_off00010cb9.bin
38212f599b676190d545fe1ea9e75fd8443437127cc40125313383b434b42d43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB9 17668 bytes
font_02_sfnt_off00013ae2.bin
932576fdeba998447ebc46600079b119c84ef570ee69abdb442aad4006dd9cf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE2 10728 bytes

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