Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d50cd6f46b2785f…

MALICIOUS

PDF

37.8 KB Created: 2020-04-16 12:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 644cdf27216959f00c18656bbf5801b2 SHA-1: 712603f96750c6540a82e14330eff475be188dd2 SHA-256: 6d50cd6f46b2785f86efb9f0d7e75b2fce3e97f03998a19943f165f84573f840
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, masquerading as a calendar template, which is indicative of SEO spam or a phishing lure. The heuristic 'PDF_SEO_LINK_FARM' specifically flags the presence of a mass external PDF link farm, suggesting a coordinated effort to drive traffic to potentially malicious or low-quality sites. No scripts were extracted from this sample.

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://sensitiveminds.org/uploads/1/3/0/5/130538840/130538840.html#march+april+2019+calendar+template
    • http://top20sydney.com/uploads/1/3/0/5/130590698/fesufifinewizipuz.pdf
    • http://bodyoilsbybrenda.com/uploads/1/3/0/9/130969274/sedikusevibe-zokalefozulotes.pdf
    • http://surfingwithocean.com/uploads/1/3/0/6/130604425/3631530.pdf
    • http://rocones.com/uploads/1/3/1/4/131406780/biwamajurimisenojuz.pdf
    • http://soulchambergaming.com/uploads/1/3/0/6/130605135/8a80b22f3a32aae.pdf
    • http://silentmanfilm.com/uploads/1/3/0/2/130291572/86da7e0.pdf
    • http://dakotanaturalgoods.com/uploads/1/3/1/3/131380210/jiwuludikapobid-beriwetovuxus-wesiveraxem.pdf
    • http://rebeccalmontgomery.com/uploads/1/3/1/1/131164447/5987414.pdf
    • http://padelsportsnetwork.com/uploads/1/3/1/4/131413222/8ff9029003c4.pdf
    • http://democraticclassrooms.com/uploads/1/3/0/2/130288406/5898100.pdf
    • http://vermontweddingsites.com/uploads/1/3/0/5/130588613/misolizi.pdf
    • http://handwsports.net/uploads/1/3/0/6/130621026/2411788.pdf
    • http://saferescuefordogs.com/uploads/1/3/0/6/130621871/guwedobuwiloned_bilin_nukaxidobuv.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_off00006417.bin
2265c95b941fbaa978526878c1161dd35e741ec3fe695f8469042245675bd5b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6417 7560 bytes
font_01_sfnt_off000081a4.bin
d907c570f1f8f2d62f38d7529dbf77de46ca3a1917ec53aca7a78bae59874b04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81A4 2616 bytes

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