Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a5ba87369a414e…

MALICIOUS

PDF

76.3 KB Created: 2021-07-13 14:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0aacb5bfeaad668783ea2ed4e64d6d20 SHA-1: 3856ec95d489c1f2a0839f137540c71185e3db0b SHA-256: 84a5ba87369a414e3ed971b22a7f147bde12b19830ba7323bd32d12e156d7610
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The presence of embedded URLs suggests an attempt to lure the user to a malicious site, likely for credential harvesting or further malware delivery. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9125

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/UZrB20b2Dcg/square?utm_term=a4+paper+width+and+height
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ecceb2688cba50b67423de/1626132146450/zanuzuperalewowam.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e91a7b37da2614570de45a/1625889403395/vubofabivudorizonilaji.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e90183f107ff2467e7c142/1625883012175/rogapijexirawepomibadu.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e9019a0cbdad4d35049ff8/1625883034134/division_property_of_laplace_transform.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec7d655978cb5ccaaa3918/1626111333537/who_sang_oh_baby_you_got_what_i_need.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_off0000c977.bin
c4d4d717915cf7297779fc2b2fd1c998cb4ee3fa4dff4b248da0224f67982895		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC977 16876 bytes
font_01_sfnt_off0000f5db.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DB 16792 bytes
font_02_sfnt_off00010df2.bin
5d6b504330fc9f484962f9c4e4420715b201fce0ce43a16d7df275264acabb38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF2 10480 bytes

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