Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a6d4a6c3729c66…

MALICIOUS

PDF

46.6 KB Created: 2020-04-01 16:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 31f011efdf5bd59314cebfa3913c0918 SHA-1: 3bf25c901215e224d3680c1c107f3fc12516c0c9 SHA-256: e3a6d4a6c3729c66d042f77a89365dfe9eaa7652f031cb00bcbbd0b409177306
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 similarly structured URLs on different domains. This pattern is indicative of a link farm or SEO spam campaign, designed to drive traffic or potentially host malicious content. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body is heavily obfuscated.

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://paramountplumbingservices.net/uploads/1/3/0/6/130604310/130604310.html#verbos+en+aleman+con+kommen
    • http://suicidepreventionproject.com/uploads/1/3/1/3/131380720/liris.pdf
    • http://camirefamily.com/uploads/1/3/0/7/130738831/bivurumev.pdf
    • http://khaterahparwani.com/uploads/1/3/0/7/130776413/2530726.pdf
    • http://stonegategeographicsolutions.com/uploads/1/3/1/4/131482828/memaviguligiwixis.pdf
    • http://addiscakes.com/uploads/1/3/0/6/130621714/c354961258c77.pdf
    • http://tiffanieharrison.com/uploads/1/3/0/6/130639862/kipobaru.pdf
    • http://dloutfy.com/uploads/1/3/0/2/130272890/7164786.pdf
    • http://ecozone3.com/uploads/1/3/0/8/130874146/9998078.pdf
    • http://caniblissart.com/uploads/1/3/0/4/130490117/4228470.pdf
    • http://campeaosoccer.com/uploads/1/3/0/7/130739120/e1ead2e40.pdf
    • http://humdingergaming.com/uploads/1/3/0/6/130621163/ffe5a.pdf
    • http://thefitboxhouston.com/uploads/1/3/0/2/130270945/dfb53aca8d1140f.pdf
    • http://pharma2table.com/uploads/1/3/0/7/130775241/gekubovoza.pdf
    • http://gardenofchloe.com/uploads/1/3/0/5/130545985/bazijob.pdf
    • http://hotlatinremix.com/uploads/1/3/0/7/130739156/9054340.pdf
    • http://cdstreetworks.com/uploads/1/3/0/7/130739740/3535699.pdf
    • http://maybachconnection.com/uploads/1/3/0/3/130313002/xukut.pdf
    • http://mail.lillianabel.com/uploads/1/3/0/7/130739133/duxesogafufikosip.pdf
    • http://mrdoghk.com/uploads/1/3/0/6/130639370/matoxisegoxa.pdf
    • http://kleklazo.site/uploads/1/3/0/5/130551417/9c6e1c066.pdf
    • http://natroheal.net/uploads/1/3/0/5/130539517/mowanidixuvulimor.pdf
    • http://linneajimison.com/uploads/1/3/0/3/130323513/wewexosifin-vofovuv-munuxonamakuz-bibonuwapedodu.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_off00007251.bin
64f3e9728d38b20ba4779da019425b5142e2b2d34bb56f40b1e9c4686c53e49f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7251 9980 bytes
font_01_sfnt_off0000955b.bin
cd75142faa664384e018e5309c2a17c6a3636875fb254f0a384bb7d06e04a3f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x955B 16232 bytes

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