Malicious PDF — malware analysis report

Static analysis result for SHA-256 44111518ac8161fa…

MALICIOUS

PDF

52.6 KB Created: 2020-04-03 09:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2d21facd9f6ad23a4f6d3c47a30d566c SHA-1: 908f1324750a1f99d9c53ba22d8be49b681282aa SHA-256: 44111518ac8161faf1c9147263d49d32d170cb8c49239ff175f1e5a03aa3a90e
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, many of which point to other PDFs hosted on unrelated domains. This pattern is indicative of a link farm designed to manipulate search engine results or distribute malicious content. The document body itself is largely obfuscated but contains a URL that appears to be part of this network. The ML classifier strongly flagged this PDF as malicious.

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://fit1athletics.com/uploads/1/3/0/7/130776517/130776517.html#propiedades+quimicas+de+las+sustancias+naturales
    • http://dfwdirectory.com/uploads/1/3/0/7/130775528/nidakogupe-vuvanaluwira-mazolixuju-pirup.pdf
    • http://watersportsinkorea.com/uploads/1/3/1/1/131163927/60ea9aef3.pdf
    • http://mathieucassegrain.fr/uploads/1/3/0/2/130270768/korejap.pdf
    • http://translatica.lt/uploads/1/3/1/4/131452804/4851b903c35e11.pdf
    • http://al-cooley.com/uploads/1/3/0/5/130546923/mipidijefudiwedoz.pdf
    • http://beerhappydesigns.com/uploads/1/3/0/6/130604032/negakikona-dirawawute-noloza-pupubibabesi.pdf
    • http://steelmagnoliahandcrafted.com/uploads/1/3/0/4/130490875/pinux.pdf
    • http://modpostr.com/uploads/1/3/1/4/131410094/nowobadaxofizipa.pdf
    • http://premium-solar.com/uploads/1/3/0/9/130969973/5102254.pdf
    • http://prozenglobal.com/uploads/1/3/0/6/130604671/fijirezavemigin.pdf
    • http://conifs.com/uploads/1/3/0/6/130605312/1f1462.pdf
    • http://southlyontowingservice.com/uploads/1/3/1/3/131398521/40c01e4c5bc7.pdf
    • http://gideonandromeo.com/uploads/1/3/0/5/130543536/noxiturivivo-geviduzivefusip-gapawulatu-wujokud.pdf
    • http://empowered-woman.com/uploads/1/3/0/7/130738576/adc96b612f052.pdf
    • http://holamery.com/uploads/1/3/0/5/130546343/gewekawijo-semapus-bojad-tetul.pdf
    • http://theconnectionsacademy.net/uploads/1/3/0/8/130814076/vimixosakavozo.pdf
    • http://allisoninserro.com/uploads/1/3/0/2/130287456/00fdd28.pdf
    • http://tappanlife.com/uploads/1/3/0/6/130620251/fapopijovar.pdf
    • http://sanchezlegal.com/uploads/1/3/0/2/130270864/xuxalezi.pdf
    • http://partyriesling.com/uploads/1/3/0/3/130313263/gigosik-zomizijezulufab.pdf
    • http://arthurcountywolves.org/uploads/1/3/0/5/130588724/5366519.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_off000080fa.bin
7d7746b7a82f654ff1c44d6381eb7f136e11b79168cb8b7b3b39b6f727d15167		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80FA 9216 bytes
font_01_sfnt_off0000a1d5.bin
0d9956ff97dd308205517a849611c7f41a0590ede414a7a9fdde73cac6a2b196		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1D5 2968 bytes
font_02_sfnt_off0000ac53.bin
a8c50b7085745848c8ed426ff50dbbfc59f2cd892d874706d31079144a1b9638		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC53 16164 bytes

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