Malicious PDF — malware analysis report

Static analysis result for SHA-256 46cead94fb4ca3a4…

MALICIOUS

PDF

76.2 KB Created: 2021-07-13 18:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 88b77c4adbb6a5554751ee6cd029cafb SHA-1: e515e6e432ff3ea37a6476c48bde981ffda0bdbc SHA-256: 46cead94fb4ca3a411f6cafc51e9f23c83b9d2e08b8598326089020db078546e
66 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV with a signature indicating it is a phishing trojan. The presence of embedded URLs, although currently flagged as benign, suggests an attempt to redirect the user to malicious content. The PDF structure also shows signs of manipulation with duplicate object bodies, which can be used to hide malicious code.

Machine Learning

  • Nyx PDF Classifier clean score 0.2303

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/razvivatel/yapz/~3/IdU8rIDf9lQ/square?utm_term=interior+angle+of+a+10+sided+polygon
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e965911448b061984a7210/1625908625763/how_many_sentences_is_a_college_paragraph.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec7b1e4a8bde38c343c7ad/1626110750681/use_ira_to_buy_house.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_off0000c5db.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DB 16792 bytes
font_01_sfnt_off0000ddf2.bin
6df688a497b354c46a607049f302990d78d61f120256e83d7c68fa4b5b158b99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF2 10912 bytes
font_02_sfnt_off0000f72a.bin
0445bab7fc1d8d13e10a2667475d869e99fba3f48484219359860c3d95611229		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF72A 16924 bytes

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