Malicious PDF — malware analysis report

Static analysis result for SHA-256 31678c4da20458dd…

MALICIOUS

PDF

40.6 KB Created: 2020-04-25 03:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b21f94ba9f7ac26744647ebef2eb46d4 SHA-1: 2ed7f16349b218d95cdcf25a8491093a2064c341 SHA-256: 31678c4da20458ddacc79ec774ef494bea771ef2b06fbb4d421c8e3d24ee2c0f
92 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, a common technique for SEO poisoning or distributing malicious content. The ML classifier strongly indicated maliciousness. No scripts were extracted, but the presence of numerous external links suggests a delivery mechanism for further malicious payloads or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://andresexpres.com/uploads/1/3/1/8/131858403/131858403.html#samsung+android+dual+sim+phones+below+5000
    • http://samanthajanehealth.com/uploads/1/3/0/7/130739056/nesirumexomedun_jojalu_rubupite.pdf
    • http://genius-encel.fr/uploads/1/3/0/7/130740199/rekuvonu.pdf
    • http://investorvisas.net/uploads/1/3/0/8/130814531/e718ac0ac9.pdf
    • http://voteshayne.com/uploads/1/3/1/4/131408056/xibefokew.pdf
    • http://asdar.net/uploads/1/3/0/3/130379072/kusuw.pdf
    • http://creativesolutionproperty.com/uploads/1/3/0/9/130969334/29514f5526aa0d0.pdf
    • http://uavoftexas.net/uploads/1/3/0/4/130483478/c06dee08e0c.pdf
    • http://careforbody.net/uploads/1/3/0/7/130776539/2547489.pdf
    • http://hoopspatrol.com/uploads/1/3/1/4/131482941/lutefoviv.pdf
    • http://hugeprofit.net/uploads/1/3/1/6/131606169/gakepep-juxatatumejeda-luwelisib.pdf
    • http://matthew1924foundation.org/uploads/1/3/1/4/131454466/2e2b16851133234.pdf
    • http://carabdesignstudio.com/uploads/1/3/0/6/130604675/222459.pdf
    • http://lindo.xyz/uploads/1/3/0/2/130289630/libijikulaviku.pdf
    • http://therapistforasians.com/uploads/1/3/1/4/131483201/5468021.pdf
    • http://lauhap.net/uploads/1/3/0/6/130604285/mimodexisu.pdf
    • http://hugeprofit.net/uploads/1/3/1/6
    • 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_off0000612b.bin
3d162f975639d1c0a2a6b69f75838f19200afe45953ed0ac03a67c25592c71a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x612B 7916 bytes
font_01_sfnt_off0000802c.bin
32b54217619f9438721b423dc2f4f4da0f78781b0811ea49af2be6b0310ecf56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x802C 16164 bytes

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