Malicious PDF — malware analysis report

Static analysis result for SHA-256 a40f0b4b8ea7ad14…

MALICIOUS

PDF

75.3 KB Created: 2021-07-18 04:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a0712aac76cdb6f81db8053a87e352f1 SHA-1: dace026931717e34fbbe3d4b7dee9d330aab9e32 SHA-256: a40f0b4b8ea7ad14e8ac36fdf72ae027e810a3c2165a2ac26f669d708ff5dad9
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a signature indicating phishing and trojan activity. It contains an embedded URL that, while labeled as benign, is presented in a context that suggests a lure for software downloads. The PDF structure also shows signs of manipulation with duplicate object bodies, which can be used to hide malicious content.

Machine Learning

  • Nyx PDF Classifier clean score 0.2489

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/y83TWYo-3DA/square?utm_term=survival+craft+download+pc+free+full+version PDF link annotation
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee2b6cdf274736e0aa36df/1626221421104/weweva.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec7aa3288cf71862a8a7d1/1626110628097/stye_differential_diagnosis.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC745 15784 bytes
SHA-256: 5b5a97b3ac6f10526d6a732200432d516cc1a5a13aeb637d3ba502a79b797ddf
font_01_sfnt_off0000eff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF9 10940 bytes
SHA-256: 39df36be3768d3c190708cc092467a249d83c2fdce502bdb41fbd13d13fff410
font_02_sfnt_off0001097d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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