Malicious PDF — malware analysis report

Static analysis result for SHA-256 70906bbbb4c276eb…

MALICIOUS

PDF

45.2 KB Created: 2020-04-09 04:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 598333cecfbf1a09aa6ccc00f26f6b6a SHA-1: 2dce020b01c1f9ed4b41391c733913c6d06e2a3b SHA-256: 70906bbbb4c276eb651a1cfeb6be99a82a58b360d30b847c9944ba0af8eaed71
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document exhibits characteristics of a link farm or SEO spam, embedding a large number of external URLs. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior, indicating a potential attempt to manipulate search engine results or direct users to malicious content. While no scripts were directly extracted, the embedded URLs are the primary indicators of malicious intent, likely serving as lures or downloaders for further stages.

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://backandbarberingstudio.ca/uploads/1/3/1/4/131437949/131437949.html#diferencias+entre+miosina+y+actina
    • http://aplusridgebackhounds.com/uploads/1/3/0/5/130550690/xifigopexevozup.pdf
    • http://keithrobertson.org/uploads/1/3/0/6/130620557/155959.pdf
    • http://abco-ca.com/uploads/1/3/0/4/130476795/wolagavijusagewomes.pdf
    • http://mendridgerealty.com/uploads/1/3/0/7/130776249/7058051.pdf
    • http://zackcaparelli.com/uploads/1/3/1/3/131378960/lazawinapabe.pdf
    • http://bloglazysunday.com/uploads/1/3/0/4/130488092/pusosavikem.pdf
    • http://bestilljill.com/uploads/1/3/0/5/130539928/fiwulaweximekesi.pdf
    • http://aronson.info/uploads/1/3/0/6/130621928/niluwutupud.pdf
    • http://datalytechs.com/uploads/1/3/0/6/130605040/xibodobetedenez.pdf
    • http://crossnationlogisticsllc.com/uploads/1/3/0/5/130540453/lidolevokubimitobi.pdf
    • http://garterbarter.com/uploads/1/3/0/6/130639911/2069990.pdf
    • http://globalsecurityinnovations-inc.com/uploads/1/3/1/4/131406441/misuxawezegux.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007779.bin
3397c6f0fbbe3cae8bab12ec6535f62f563d116c75c1d5781ae90872c9efb468		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7779 10684 bytes
font_01_sfnt_off00009a9c.bin
c048ac4ed90d63bfae46472f65f9cf6fc0bd5e75369f2d8f28771a6d96a2731c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A9C 3156 bytes

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