Malicious PDF — malware analysis report

Static analysis result for SHA-256 263fb4316b80c14c…

MALICIOUS

PDF

34.6 KB Created: 2020-04-06 07:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ee789b0613084ddc8a84714aba2e40a8 SHA-1: 93e456244c230b27348c6d686f63b2b86208e3ee SHA-256: 263fb4316b80c14ca1ee707c225f999aed46f0b675d353882df755014d0c2670
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains numerous external links, a technique often used in SEO spam or link farm attacks to drive traffic to potentially malicious websites. The document body, though heavily obfuscated, contains references to "Bohemian rhapsody bass guitar tab" and "wkhtmltopdf", suggesting a lure to attract users interested in music tabs. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent. No scripts were extracted, limiting the analysis of direct payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 http://teshuvah.international/uploads/1/3/0/4/130488396/130488396.html#bohemian+rhapsody+bass+guitar+tab
    • http://allmetusa.com/uploads/1/3/1/3/131380915/takuximegufis.pdf
    • http://coffee-god.com.tw/uploads/1/3/0/2/130289523/b370f57be2a099.pdf
    • http://deyredesigns.com/uploads/1/3/0/6/130620424/1aa44.pdf
    • http://pressburg-partners.com/uploads/1/3/0/6/130620842/c2380ec.pdf
    • http://dholeconservationfund.org/uploads/1/3/0/5/130544132/mitewi.pdf
    • http://thetastyj.com/uploads/1/3/0/8/130814782/7623282.pdf
    • http://pls21916453026.com/uploads/1/3/0/7/130739852/97a1e2a9a8000.pdf
    • http://s2bp.com/uploads/1/3/0/9/130969051/7736752.pdf
    • http://cmoorebrowsbeauty.com/uploads/1/3/0/5/130545128/9514360.pdf
    • http://viperteam.org/uploads/1/3/1/3/131381428/mubaxewedububodagepa.pdf
    • http://saltcityvolleyball.com/uploads/1/3/0/4/130489725/gurat.pdf
    • http://ndposceola.com/uploads/1/3/0/2/130272291/sojividoz-xatatur-tasatipuzame-xifiv.pdf
    • http://miriraisithole.com/uploads/1/3/1/4/131406806/8204725.pdf
    • http://bluegrassbirthjourney.net/uploads/1/3/0/9/130969644/6825916.pdf
    • http://joepadremusic.com/uploads/1/3/1/3/131381352/puzetu.pdf
    • http://joepadremusic.com/uploads/1/3/1/
    • 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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006304.bin
597f34e1b0e33de31dac84c395d7ccffdabd586aadd62b2f7f050fdec3b38257		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6304 6468 bytes

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