Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc62fdab8c50f84e…

MALICIOUS

PDF

80.2 KB Created: 2021-07-15 13:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b90bc842511e587dce12b71a455cfbd3 SHA-1: 0ba0dc70da5352fa90f194c2ce32d8498ab5e849 SHA-256: fc62fdab8c50f84ea15ab76f750beacf5ac8a44ede4c87ad5f1eaf6f2e9872a1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL pointing to 'chcial.ru', which is likely a phishing or malicious site. The PDF structure itself is obfuscated, and while no explicit scripts were extracted, the presence of external URIs and the overall detection suggest an attempt to redirect users to a malicious domain for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8298

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://chcial.ru/square?utm_term=saturated+fats+are
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e76a8d92f10d555d2577cf/1625778829369/jomezevewumogibenitelob.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec7a13de8c3264fe5dede4/1626110483251/81045843356.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec707ac8b0d544b6d5a912/1626108026996/one_more_time_one_more_chance_mp3.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ed943850566b3f86653ec8/1626182712613/area_of_a_triangle_without_height_calculator.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec9f93a1b53f2c22608699/1626120083994/social_media_advantages_and_disadvantages_in_tamil.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_off0000da2f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2F 16792 bytes
font_01_sfnt_off0000f246.bin
d9ae35ab121363118a29e56060592773a4a8a63ae3ffdd615749c93cde1d4d46		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF246 10160 bytes
font_02_sfnt_off00010921.bin
cc65945a0ace5f8909c49752b5198281365e099cbf5b57883f19f26d18fa155b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10921 16924 bytes

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