Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad9b71a4516e6f4d…

MALICIOUS

PDF

79.1 KB Created: 2021-07-13 19:40:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f994f262985aca9f36e92f173e426331 SHA-1: 3e7f7dcc80b3e9669cadd975dcf50cbe400a927d SHA-256: ad9b71a4516e6f4d812be14749b0091bcee416ea19401d1b2286d05a21ab8e80
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URL that, despite being labeled as benign in the provided context, is part of a lure to download software. The PDF structure and embedded content suggest an attempt to trick users into executing further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8666

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/UZrB20b2Dcg/square?utm_term=gta+5+skip+verification+apk+android+download
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ed9ea7151a035e9e7bdcaf/1626185383563/78628671127.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ed89a1bc9b4721000e991f/1626180001942/companion_for_2nd_mbbs.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e8e4fb0cbdad4d35030807/1625875707241/42855063209.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e8010f23621b4743e56836/1625817359623/munidan.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e9027366be7e490f0e58f4/1625883251856/11785182192.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec7961b6dedd3ae167cc37/1626110305988/download_call_of_duty_mobile_obb_file.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e95d63c91b61347ea552ac/1625906531732/bomeguzixaxifibux.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_off0000d23b.bin
70c917afb8f88b98d6d433ce782b42fa57df3053fd3c431f3280cd98311587b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD23B 16824 bytes
font_01_sfnt_off0000fe37.bin
da1ce1c0d726b27f426ea497791ab77776cebb59049b30f6b1802cf62ab9399e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE37 11032 bytes
font_02_sfnt_off00011830.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11830 16792 bytes

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