Malicious PDF — malware analysis report

Static analysis result for SHA-256 538589a1254b757b…

MALICIOUS

PDF

36.1 KB Created: 2020-04-20 03:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ba591a7aa29d9ad63f48c67cad565474 SHA-1: e2b77dd866ab9386c3b7207774709d465609808c SHA-256: 538589a1254b757bc62f18661317295bcd74876ff15590920a05aaf7a67f8e0d
92 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. No scripts were extracted, but the presence of numerous unknown-reputation URLs suggests a delivery mechanism for further malicious activity.

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://cardifftrailertransport.com/uploads/1/3/0/6/130640231/130640231.html#tra%C3%A7o+falciforme+que+significa
    • http://favoritzrestaurantandlounge.com/uploads/1/3/0/2/130270991/5933828.pdf
    • http://prencor.com/uploads/1/3/0/2/130288318/gezizalexib.pdf
    • http://nashbw.info/uploads/1/3/1/4/131483249/bf58c214d62.pdf
    • http://jasonschulze.com/uploads/1/3/0/6/130604314/4579119.pdf
    • http://phumyhungmidtown.net/uploads/1/3/1/4/131406020/laxem.pdf
    • http://afterlifetvnetwork.com/uploads/1/3/0/3/130313263/nexupilapub-batufesusezerum-mipedop-wawakakimil.pdf
    • http://epimaxusa.com/uploads/1/3/1/0/131070754/23efa0281.pdf
    • http://lifelongdrop.com/uploads/1/3/0/8/130874285/liwozofifibujuwu.pdf
    • http://larremoremusic.com/uploads/1/3/0/7/130775515/lipoxevedimil.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_off000060d4.bin
8004093634bce450cf36d2fe1ac977a7bcc2f66b0e2824ced0aa1abc303476ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60D4 10680 bytes

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