Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad7174132f78b13d…

MALICIOUS

PDF

49.6 KB Created: 2020-04-09 11:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2f18a41785d296d6137264f36ac5c690 SHA-1: 9ccbc80aeda8c17034dac75d8a22ca4a1ee13ad8 SHA-256: ad7174132f78b13dcc1583755ce665ad5e23964484732b3aa9d8b7f249846b65
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files on different domains. This behavior is indicative of a link farm, likely used to distribute malicious content or engage in SEO abuse. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body is heavily corrupted, but the presence of numerous external links is a clear indicator of malicious intent.

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://masonleigh.com/uploads/1/3/0/5/130551132/130551132.html#examen+lainitas+primer+grado+segundo+trimestre
    • http://wacommercialappliances.info/uploads/1/3/0/5/130590058/pizuterafe.pdf
    • http://high-country-villas.com/uploads/1/3/0/6/130621649/ralevut-pajakuj-ziwavug-varobitowo.pdf
    • http://triumphbikerentals.com/uploads/1/3/0/4/130435717/128e8730b.pdf
    • http://karenjstoweconsulting.com/uploads/1/3/0/5/130550967/4679034.pdf
    • http://labeautephotographie.com/uploads/1/3/0/5/130543025/kezot.pdf
    • http://edisondebate.com/uploads/1/3/0/6/130603814/d05cdb4fc61.pdf
    • http://unboxedevents.com/uploads/1/3/0/4/130489564/99004.pdf
    • http://jameshuntermarshall.com/uploads/1/3/0/6/130621532/nafoxarere_pobevitari.pdf
    • http://ecopowerelectric.net/uploads/1/3/0/7/130776122/3237478.pdf
    • http://tgi420.shop/uploads/1/3/0/8/130874376/1d421802d5839aa.pdf
    • http://betabuilders.net/uploads/1/3/0/8/130814553/reselazu.pdf
    • http://xtremetruckandtrailer.net/uploads/1/3/0/4/130483294/9a690f396.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_off00008a2d.bin
2ada4528df6d8ee3fa426d863e3a663360d9319c48c8271130feb566425c77c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A2D 10104 bytes
font_01_sfnt_off0000ade6.bin
ad6001544931b982f6f7da1832bf13fec8344b0eac1307571a142e09cd2bc38c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADE6 2628 bytes

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