Malicious PDF — malware analysis report

Static analysis result for SHA-256 747a6db97f9d6174…

MALICIOUS

PDF

34.9 KB Created: 2020-05-14 17:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8f79f4fe56648a095090df1be27d409 SHA-1: cff830c795df7c071284319ab8e76a651e7f8942 SHA-256: 747a6db97f9d61741cce3c14484df5cdbd090fbb642156e8cbd6c29491932f8a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on different domains. The ML classifier also flagged this PDF as malicious. The embedded document body text, though heavily obfuscated, contains a URL that matches one of the extracted external links, suggesting a deliberate attempt to direct users to external content. The primary attack pattern appears to be the distribution of a large number of links, likely for SEO manipulation or to serve malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://anaheimhillsbuzz.com/uploads/1/3/0/6/130604641/130604641.html#bootstrap+modal+contact+form+example
    • http://thinkwomencompany.com/uploads/1/3/1/8/131857049/gojegudada.pdf
    • http://yourforte.info/uploads/1/3/0/7/130740458/8ec86b591c1.pdf
    • http://prismismstudios.com/uploads/1/3/0/7/130740080/0f3bb37968.pdf
    • http://jilleversmartin.com/uploads/1/3/0/7/130739070/revixilezafuli.pdf
    • http://conventionbandorlando.com/uploads/1/3/0/7/130739254/guroruwiveda_vufobafagasira_janomelefe.pdf
    • http://mydailybookkeeping.com/uploads/1/3/1/3/131380045/pakenipepudal-fuponir-dudezurug.pdf
    • http://xhailmartinez.com/uploads/1/3/0/3/130313790/kaxakuma.pdf
    • http://chandlerconstructionnapa.com/uploads/1/3/0/3/130313173/8858930.pdf
    • http://uptownjerkyco.com/uploads/1/3/1/4/131454151/8cb31abfd06c.pdf
    • http://estesparkems.com/uploads/1/3/0/6/130604947/84e83eb5058f.pdf
    • http://ebktmlimited.com/uploads/1/3/0/3/130313247/rarusono_vazirofogevogi_rowarowonulu_todep.pdf
    • http://nycsessionsinger.com/uploads/1/3/1/4/131406715/tudum.pdf
    • http://positivi-z.com/uploads/1/3/1/3/131398440/a3c152f00ce3.pdf
    • http://suncitycarolinalakes.net/uploads/1/3/0/2/130291696/viperuvesone.pdf
    • http://lucasmidisbr.com/uploads/1/3/1/4/131437025/gaboviwijajo-jinowanegezane-somuzer.pdf
    • http://erikadeesdogcookies.com/uploads/1/3/0/7/130775123/kowasexi.pdf
    • http://archbusinessbrokers.com/uploads/1/3/1/4/131437253/4262240.pdf
    • http://tcmphoto.com/uploads/1/3/0/5/130589140/6065881.pdf
    • http://hairmineralcheck.com/uploads/1/3/0/6/130621636/57b57c93b.pdf
    • http://suministrodemedicamentos.net/uploads/1/3/1/4/131454383/1793699.pdf
    • http://amyfbrown.com/uploads/1/3/1/4/131406207/mapoxareletuju.pdf
    • http://doubleshiftpress.com/uploads/1/3/0/2/130272932/simigedokiw_daxizem_tedirimotef.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d6a.bin
f9f88aa2b13d509969db373effb78e2b71bb60a5a2b6e04783b2f3000606f3cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D6A 10044 bytes

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