Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb90ab66910e7803…

MALICIOUS

PDF

79.3 KB Created: 2021-07-12 21:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd66c3b3ec16fb0e8c0f505054268869 SHA-1: 6e34f7bf5a62782b7446d90daa56eb5c404b19ef SHA-256: cb90ab66910e78038eeff5b8e9750e86034a79643249cd87798500e1389c0ca2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely part of a social engineering attempt to trick users into visiting a site that may host further malicious content or phishing forms. No scripts were extracted, but the overall structure and embedded URI suggest a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9511

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://medvor.ru/square?utm_term=pdf+files+will+not+open
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec7a6a40121f5668990002/1626110570970/97105442477.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec7910dd2ac847ff7d8d80/1626110225136/pre_blessed_food.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8e83e83ae0c4902362499/1625876542607/mhw_insect_glaives.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec88dcc217102653d6bae5/1626114268876/the_tale_tell_heart.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec7f3b700aa07a78947acc/1626111803172/bang_on_meaning_in_english.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7b5aa85664d35b0e58404/1625798058233/turbo_download_manager_apk.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec737f8300fd66e1948d9b/1626108799836/american_english_examples.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec8689ff9c8b53cea2cba2/1626113673826/sinufifenovisuduw.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_off0000d6e3.bin
3f3688d9af38db1ddba9b62f3a40d83e24bd17bfd5cd5b68bce168f73c66aeb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E3 10316 bytes
font_01_sfnt_off0000ee49.bin
8d19837da0609e277495c72cca395db449598bd1f1f81942cc19182d3645ebcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE49 16472 bytes
font_02_sfnt_off0001194d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1194D 16792 bytes

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