Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ac4d5b2b16c5117…

MALICIOUS

PDF

78.7 KB Created: 2021-07-14 09:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f61badeea393ca0c9b96d759d2eb6d6 SHA-1: 90ddf87f5728a9c6469aa570d6e13276d0acb87d SHA-256: 6ac4d5b2b16c511780c62bf5984ee1204a6180e46c33d1088d6828c2bd3ee3d8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The embedded URL, https://inwebjor.ru/square?utm_term=estate+as+beneficiary+of+life+insurance, is likely used to deliver a malicious payload or redirect the user to a phishing site. No scripts were extracted, but the PDF structure and heuristics suggest a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8028

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://inwebjor.ru/square?utm_term=estate+as+beneficiary+of+life+insurance
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee6af8537273346e328743/1626237688855/heart_of_darkness_summary_in_tamil.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8e4c8dc37083541b5a7f4/1625875656212/39511996097.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e965d1320dbd0de282f156/1625908690153/rizideferaropobesavujol.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e7f42b95719b356d93e888/1625814059259/meaning_of_good_friday_in_the_bible.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60edcb44c6126f45c3e00090/1626196805072/midpoint_and_distance_formula_zombie_worksheet_answers.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_off0000cf97.bin
a309eca276e001e08df64f99025c9de174645a02d9919385e90c7bde9bf0628b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF97 17228 bytes
font_01_sfnt_off0000fc87.bin
7510b3c78f263b40c407a81a3cbad6a40133aa25313e0be2408fe1ef363791e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC87 10664 bytes
font_02_sfnt_off00011526.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11526 16792 bytes

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