Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18f92b3e4dbc4f6…

MALICIOUS

PDF

91.1 KB Created: 2021-07-17 08:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 80c6be2630e87c24e4f610fbf82238d7 SHA-1: e2a46306c9d8f3a17789f319962f93627528941a SHA-256: b18f92b3e4dbc4f686126c02b327d73bb38f2b711c9606a80a28cb6956df2cb9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with a specific ClamAV detection name indicating it's a phishing trojan. While no scripts were extracted, the presence of an embedded URI pointing to a Google feedproxy URL suggests an attempt to redirect the user to a potentially malicious site. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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/iYdez4bKglI/square?utm_term=20th+century+scientists+and+their+inventions
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8eaf3563c1506a8b368af/1625877235496/terikarovomejikonarig.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e9491d854c1d3b34881604/1625901341192/causes_of_supracondylar_fracture.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f1953989c21a24009bc8b9/1626445114176/5887807872.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ede3e66f118478735ca526/1626203110631/37871975959.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60eddb29895aae42f659dba5/1626200873768/physical_meaning_of_convolution.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ed9762d2a6f635453c6927/1626183523606/78718006209.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60efda3c1c2a3138378cc59b/1626331708246/5754399247.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e8d4d88c0097185606f4f0/1625871577193/251_calories_to_kg.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f2521bfb6d8f5e804e14e6/1626493467329/how_to_get_to_secret_messages_on_messenger.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f0a745b32fb3777072da74/1626384197830/western_civilizations_their_history_and_their_culture.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_off0001019c.bin
6813cee809d90d412be8a210c931a5995fac435619d360a8eb8d74a8c511b236
pdf-font-stream PDF embedded font (sfnt) at offset 0x1019C 17292 bytes
font_01_sfnt_off00012ec0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC0 16792 bytes
font_02_sfnt_off000146d7.bin
ad9987d16a1dc5b4456759d41ca561416f1180179cdc77e924951706c612871a
pdf-font-stream PDF embedded font (sfnt) at offset 0x146D7 10848 bytes