Malicious PDF — malware analysis report

Static analysis result for SHA-256 f63575f6d6655660…

MALICIOUS

PDF

39.7 KB Created: 2020-06-21 07:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 235f6c2bb229aff513ede651e50c679e SHA-1: ff6f38db56bdcb8b00e987dd8b4c06ec8cfe983b SHA-256: f63575f6d6655660dfaa115d47713959e1d338d631cc2567c9958e744dd98194
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are part of this link farm. This suggests the primary purpose is to redirect users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://apccrc.net/uploads/1/3/1/6/131606275/131606275.html#kirana+items+list+in+telugu+pdf
    • http://transformologywithhelen.com/uploads/1/3/0/3/130323285/vaxuga.pdf
    • http://orchardinternationalrealty.com/uploads/1/3/0/8/130814337/kidasuvamefotaj.pdf
    • http://manaaki.fitness/uploads/1/3/0/3/130323506/fovovir_kanesu_vegovugufiba.pdf
    • http://supremehandsbyty.com/uploads/1/3/1/4/131410009/9344288.pdf
    • http://withmamasnature.com/uploads/1/3/0/5/130550763/jamofuz.pdf
    • http://chicagovoicetalent.com/uploads/1/3/0/6/130620327/2df4d0.pdf
    • http://evolbliss.com/uploads/1/3/0/5/130588811/nusupew_kasozadipuxani.pdf
    • http://novahvacpro.com/uploads/1/3/0/6/130621290/2c9ed1adb620c2.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d67.bin
db0da7d3aba0d44b985c7e837030b2b3af3a25ce5d98609ff5102f6c7bca1c1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D67 5100 bytes
font_01_sfnt_off00006e9a.bin
8ac6f43496c11df33f85565a7be4d214ff34df1e777dc8b0961abd80af62d9c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E9A 9860 bytes

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