Malicious PDF — malware analysis report

Static analysis result for SHA-256 544379b3e3e48a70…

MALICIOUS

PDF

76.0 KB Created: 2021-07-15 10:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e190a4f042f84d028109b576cd3be69a SHA-1: 4d8ff411b1c09ebd9099d5ecccd493b5d4de38a7 SHA-256: 544379b3e3e48a70ba647aa537bfe62c3696ebc2aee176e286aef47fdefbdbfb
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. ClamAV specifically identified it as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the presence of embedded URLs and the overall detection profile suggest a phishing or trojan delivery mechanism, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7483

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/gOBB6uaVNRA/square?utm_term=some+examples+of+diary+writing
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ee5786c27d1e40a54c0eaa/1626232710668/how_does_the_manual_transmission_work.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60efd8561a40e71890502cb2/1626331222607/no_period_after_stopping_depo_can_i_still_get_pregnant.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e81e7546a8e17713e759ac/1625824885199/72487260455.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60edca3dcb43530604a5c5e6/1626196542139/counter_attack_meaning.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_off0000c652.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC652 16792 bytes
font_01_sfnt_off0000de69.bin
be8eda616dad8b466700a85a93d7fc0af75f861257a463d53fc23b64c2cd857d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE69 11220 bytes
font_02_sfnt_off0000f882.bin
7b3bedf5057277f080a8d3b8d2024a106d008fb5f2a1846d2275748134fba579		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF882 16832 bytes

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