Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dcbc7bbf23beeec…

MALICIOUS

PDF

61.5 KB Created: 2020-04-06 09:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e23896bd6767e4f16ac2e025dbb2d0aa SHA-1: 92352ba3614268777e1496572b07ea3a48eb9624 SHA-256: 3dcbc7bbf23beeec998acc5b0b23d79cad3f7f1c74c849b72f8b56d6be175c54
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, many of which point to similarly structured URLs on different domains. This pattern is indicative of a link farm designed to manipulate search engine results or to host a large number of potentially malicious payloads. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body was largely unreadable, but the heuristic firings clearly indicate a link-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://lofofood.net/uploads/1/3/0/8/130874382/130874382.html#centro+federal+de+readaptacion+social+no.+16
    • http://pellimarket.com/uploads/1/3/0/3/130313013/5380cde2972dfb.pdf
    • http://alittledabwilldou.com/uploads/1/3/0/8/130814076/4935947.pdf
    • http://malonegroupdesign.com/uploads/1/3/1/4/131437982/larore_tixag_pimomekulebinez_xazejanebura.pdf
    • http://wegotitalltv.com/uploads/1/3/0/5/130539726/a87b1a215e75.pdf
    • http://tangercarrental.com/uploads/1/3/0/6/130604905/peboxukuzixivovaxuvo.pdf
    • http://allnbaseball.com/uploads/1/3/1/4/131437679/vebifiwumik.pdf
    • http://nsainapparel.com/uploads/1/3/0/4/130435596/maxoxadorev.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a62e.bin
795237e9ddea54cf30a03ad63ad156006cd24144eb9ab292ad999966697172fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA62E 9300 bytes
font_01_sfnt_off0000c7fc.bin
4cda5f785b161ab6df9682e6368fd2c101e9aa902a3f31947a361fc50cf1a95c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FC 2732 bytes
font_02_sfnt_off0000d1b3.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B3 16036 bytes

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