Malicious PDF — malware analysis report

Static analysis result for SHA-256 4434327f98a065ca…

MALICIOUS

PDF

52.5 KB Created: 2020-04-07 09:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3192459872030ef8cf4781cf2bd68209 SHA-1: 730099e1b05ab8c1025a3af182400e6fb471c7af SHA-256: 4434327f98a065ca2e4426df925eb15e7deab7b314f069ff1d6b40a3bc31c9ed
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body contains text related to Bible concordances, likely a lure to disguise the malicious intent of redirecting users to numerous external resources.

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://movieseaon.com/uploads/1/3/0/7/130775422/130775422.html#concordancia+biblia+reina+valera+1960+gratis
    • http://ihustlefromhome.com/uploads/1/3/0/3/130324234/forabesagarok.pdf
    • http://charlestoncharm.net/uploads/1/3/0/2/130292014/pizomavunuvit.pdf
    • http://isetfire.net/uploads/1/3/1/0/131071164/3419077.pdf
    • http://indistressco.shop/uploads/1/3/0/9/130968968/zunagorokenirorov.pdf
    • http://speedystreetcourier.com/uploads/1/3/1/1/131163536/3272132.pdf
    • http://www.alltechif.com/uploads/1/3/0/9/130969346/zukub-diwojetatupi-xasamerijal.pdf
    • http://friditas.com/uploads/1/3/0/4/130489102/6d4d8b51.pdf
    • http://360casecamp.com/uploads/1/3/0/6/130620185/fixaki_vozevereniz.pdf
    • http://freeamericantravel.com/uploads/1/3/0/4/130435509/46ec0b116f.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_off00008d4a.bin
85063dbbbc62060f3fb23c658bff4a3e1dccc8a3802fc193e4a0c057f542fe26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D4A 9264 bytes
font_01_sfnt_off0000ae53.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE53 16036 bytes

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