Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e7aedcddb0bf729…

MALICIOUS

PDF

35.3 KB Created: 2020-05-17 15:27:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2c8334f586d4c3e6469f1ff837bb01c SHA-1: 0074006e04c3dd1e5ef51fb680b314ce31eea04c SHA-256: 8e7aedcddb0bf7294704d6a64d315371382dc85ade082441eb487ca3951cd527
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to other PDFs hosted on various domains, a technique commonly used for SEO poisoning or to redirect users to malicious content. The ML classifier strongly indicated maliciousness. The embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the intent to leverage a link farm for potential malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • 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
  • 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://helpking.org/uploads/1/3/0/2/130289311/130289311.html#araldite+klear+epoxy+adhesive+data+sheet
    • http://rainbowkaleki.org/uploads/1/3/0/7/130776878/sopipazezin.pdf
    • http://wishesbrewtea.com/uploads/1/3/0/2/130289789/nokise_renom.pdf
    • http://cumminsdesignstudio.com/uploads/1/3/1/1/131164016/nufikamuzemurun.pdf
    • http://solarsevendesign.com/uploads/1/3/0/7/130739696/f47b1ba8.pdf
    • http://dianaoancea.com/uploads/1/3/0/8/130813965/samatinedok.pdf
    • http://lavelcustomcrowns.com/uploads/1/3/0/4/130488270/wokag.pdf
    • http://zhzhgao.com/uploads/1/3/0/5/130540493/d245ad685b562f.pdf
    • http://dogwalkersilford.com/uploads/1/3/0/5/130590122/nepunovijetufo.pdf
    • http://emilybrobeck.com/uploads/1/3/0/2/130289719/jezezirikupopez_nasibem.pdf
    • http://bellmateproperties.com/uploads/1/3/0/7/130740086/rubananimud.pdf
    • http://stridersrunningblog.com/uploads/1/3/1/1/131164318/5947392.pdf
    • http://maxdoraville.com/uploads/1/3/1/3/131384424/1648551.pdf
    • http://friendsfeedingfriends-topsail.org/uploads/1/3/0/5/130589309/7354665.pdf
    • http://weigh2success.com/uploads/1/3/1/6/131637881/dupatudaluw.pdf
    • http://hesperiatowtrucks.com/uploads/1/3/1/6/131637562/bisukalemususujer.pdf
    • http://vistamultifamily.com/uploads/1/3/0/6/130639325/vilopevul.pdf
    • http://beautylifeandmommyhood.com/uploads/1/3/1/4/131483265/7685771.pdf
    • http://homeandhouserefinishes.net/uploads/1/3/0/5/130538902/220906.pdf
    • http://cityscopebl.com/uploads/1/3/0/7/130776739/c9471.pdf
    • http://jmurphyproperties.com/uploads/1/3/0/8/130813780/240148.pdf
    • http://keyslockout.com/uploads/1/3/1/3/131379031/tosujufavara-wutega-nefefiw-safimepokilu.pdf
    • http://sazanpd.com/uploads/1/3/0/5/130539155/velejuk.pdf
    • http://brightfloatpods.com/uploads/1/3/0/6/130620627/43e02cf.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005dcc.bin
d775cfa66760d607c63621baa57ed947c339c997edcac5f0ed158d073f3e3f74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DCC 10308 bytes

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