Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff35914c8f91fe3c…

MALICIOUS

PDF

31.6 KB Created: 2020-04-12 01:40:08 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ece5db3202a787c68aecb88b70aa7ad2 SHA-1: 9f89a206e4ea06c552960aa6e588cd2a1f2d5455 SHA-256: ff35914c8f91fe3c6b5bc76e713698a525f12aa4a4f0bd0515a187b0f23ca3f4
96 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, many of which appear to be part of a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, but the presence of numerous external links is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://cosmeticsurgeryodessa.com/uploads/1/3/0/5/130539496/130539496.html#graco+lauren+crib+parts+list
    • http://mchenrycountyrentals.com/uploads/1/3/1/4/131410299/5119214.pdf
    • http://teachingindigenouseducation.com/uploads/1/3/0/5/130548152/pipubazixinemex_venesapisotava.pdf
    • http://thathemaybelieve.com/uploads/1/3/0/2/130289220/84159.pdf
    • http://greentexasbuilders.com/uploads/1/3/1/0/131070851/8233875.pdf
    • http://flaxpitsframpton.net/uploads/1/3/0/8/130813547/10e726dcb.pdf
    • http://norskskulpturbiennale.no/uploads/1/3/0/7/130739845/nizowegobukokidodele.pdf
    • http://galaxyslice.com/uploads/1/3/0/6/130604859/3490743.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_off0000422e.bin
9295fc546d7dc8d64ef0b152c8324319567b2f679230a227d5901385c5841221		 pdf-font-stream PDF embedded font (sfnt) at offset 0x422E 6572 bytes
font_01_sfnt_off00005c6f.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C6F 16036 bytes

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