Malicious PDF — malware analysis report

Static analysis result for SHA-256 f365aae1116b6b1b…

MALICIOUS

PDF

76.1 KB Created: 2021-07-12 20:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b5fed2b010e81fadaf748a4f0ad15fe SHA-1: 97650c14a2f6ad0c2cd8f18035b80dd0be47ffe6 SHA-256: f365aae1116b6b1be3fa6d09599d3d2ead72f51783dace9e251d85aaf1473aed
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs suggests a phishing or credential harvesting attempt, or a lure to download further malicious content. The file's structure and content, despite being obfuscated, align with typical malicious PDF delivery mechanisms.

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/~3/5VO7y1TeAqQ/square?utm_term=list+of+english+words+containing+q+not+followed+by+u
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e931f8b68d8f0f4bf8d155/1625895416567/ranusakinaririlogemojup.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e892346a4b4a6f2e73a2bc/1625854516265/anatomical_name_for_calf_muscle.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e926352f3c4128e18a7552/1625892405220/checkra1n_icloud_bypass_download.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8eeeb0cbdad4d3503b73d/1625878252090/passive_transport_in_a_sentence.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec7c705f604029b990c44d/1626111088808/87272467751.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e94f192dabf2723555ca4f/1625902873920/xujarubajasopunetil.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e8e56b2f3c4128e1871cab/1625875819188/xazogiz.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e7eb69adf2c26882014ab9/1625811818042/what_does_rtx_stand_for.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e79e914aaab0286a876e34/1625792146034/confidence_building_activities_for_students.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_off0000c90d.bin
6d9b0865cfe3203abad8651b69b64e7d34c8d9bdc9103a8f68ccd1c64d68ee72
pdf-font-stream PDF embedded font (sfnt) at offset 0xC90D 11300 bytes
font_01_sfnt_off0000e31e.bin
bfb8d2bd8bea2928918b11c71e0194bbb2df33b6a5857890f17f6cc5e7c51e0c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE31E 15892 bytes
font_02_sfnt_off00010bfa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFA 16792 bytes