Malicious PDF — malware analysis report

Static analysis result for SHA-256 8123cf249c415b67…

MALICIOUS

PDF

40.2 KB Created: 2020-03-22 09:00:52 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2ac52161b3a84ea7bd939490ba4f0143 SHA-1: f6b06462ba8948fde27fdbc078e53b780601372c SHA-256: 8123cf249c415b674e24ade363008ad622618ff71e184eeab2a0a65f0a4711df
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or distribution mechanism. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports this assessment. The document body text is largely obfuscated but contains a URL that is also present in the heuristics.

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://atlweddingstylist.com/uploads/1/3/0/8/130873946/130873946.html#reglas+mas+importantes+del+salto+de+longitud
    • http://neighbourhoodlocksmith.com.au/uploads/1/3/0/5/130589218/1983179.pdf
    • http://miseniorcenters.com/uploads/1/3/0/6/130639682/zuzened-potexalukovev-zibazuwo-mupifukutivuwuw.pdf
    • http://www.genoshousesounds.com/uploads/1/3/0/8/130874501/1012653.pdf
    • http://mickkok.com/uploads/1/3/0/6/130621472/nejemopikow_xurafexij_dinol_zamox.pdf
    • http://leesaleschallenge.com/uploads/1/3/0/5/130588210/7924372.pdf
    • http://5starlifestylehealth.com/uploads/1/3/0/7/130776457/lajibu-dijiwelapes-sevetinetowa-jopolonelilere.pdf
    • http://sumcommunications.com/uploads/1/3/0/5/130539238/7841268.pdf
    • http://steamistparts.com/uploads/1/3/0/6/130639885/bepob_rejasipatibegi_gixemasoseri.pdf
    • http://www.vorbata.net/uploads/1/3/0/3/130313152/siseba.pdf
    • http://sharedriveapp.com/uploads/1/3/0/6/130639308/bfe6d5af76.pdf
    • http://lex-sing.org/uploads/1/3/0/5/130539672/9622348.pdf
    • http://makahisland.com/uploads/1/3/0/5/130539768/9792430.pdf
    • http://zombiecloths.com/uploads/1/3/0/6/130605258/dogoruxini_wufatemirox_jufewa_lomate.pdf
    • http://dancetodaybiz.com/uploads/1/3/0/6/130639426/malebubopupi.pdf
    • http://tamtam-express.com/uploads/1/3/0/4/130483623/a772c465.pdf
    • http://www.mcnairycountytn.com/uploads/1/3/0/7/130739351/zitowep.pdf
    • http://soulofabutcher.com/uploads/1/3/0/4/130476143/26c6fefb.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007391.bin
578aaf0b30e1d18a1b86661a290f66aaccc5bda4efc9480f64e1a30cafaad13f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7391 8200 bytes

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