Malicious PDF — malware analysis report

Static analysis result for SHA-256 551552c247123160…

MALICIOUS

PDF

52.8 KB Created: 2020-04-09 15:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f8423387470373bae7d9b2eb4d91836f SHA-1: d277aeb5608959e3298219cea1b50808b4994e83 SHA-256: 551552c247123160f16f138bbc2a4e839b96c292d1b0df5c4d51755277971f2a
94 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or distribution mechanism. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the sheer volume of external links is highly suspicious and indicative of a malicious distribution or SEO manipulation campaign.

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://higherselfessentials.com/uploads/1/3/0/7/130776865/130776865.html#cuales+paises+utilizan+el+sistema+anglosajon+de+unidades
    • http://mcclaskielawnservicellc.net/uploads/1/3/0/5/130550844/vokubaze.pdf
    • http://troop14holliston.com/uploads/1/3/1/1/131163590/3492720.pdf
    • http://vasodechana.email/uploads/1/3/0/6/130639459/2097317.pdf
    • http://allbimchile.com/uploads/1/3/0/6/130604473/wegiju-nutajagedifos-nexozeveruto.pdf
    • http://livenm.net/uploads/1/3/0/7/130776408/1646240.pdf
    • http://luxuryvintagegirl.net/uploads/1/3/0/7/130739726/5fdd680225869.pdf
    • http://theapostolicchurch-newlife.org/uploads/1/3/1/4/131453747/2b238743a750f5.pdf
    • http://taylorstephentattoo.ink/uploads/1/3/0/7/130776739/8951672.pdf
    • http://tawneekruz.com/uploads/1/3/0/3/130313436/jowawomade.pdf
    • http://cebport.org/uploads/1/3/0/8/130873951/a9157217.pdf
    • http://lemontreecateringco.com/uploads/1/3/1/4/131453456/gapivugajos.pdf
    • http://splittencapital.com/uploads/1/3/0/5/130539315/lujezow.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_off000081eb.bin
e63a5d2912d071a0945ee8e09287de4707baf3692e7b0ddd9391a0150a7cc804		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81EB 9796 bytes
font_01_sfnt_off0000a4ee.bin
e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4EE 2652 bytes
font_02_sfnt_off0000ae55.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE55 16036 bytes

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