Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb025e489c12e7e…

MALICIOUS

PDF

37.8 KB Created: 2020-06-21 13:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 006bcdaf7f35defbb52dc79055aff1a4 SHA-1: e9b12f38d64e654112c6874a2693929f16d01c81 SHA-256: 1cb025e489c12e7e4e71e75e9c1c0bbaab26ab53e9092652be03a1416feb5051
92 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, a technique often used for SEO poisoning or phishing campaigns. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains references to these links, reinforcing the attack pattern. No scripts were extracted, limiting the analysis of specific payload delivery mechanisms.

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://sundogstills.com/uploads/1/3/0/2/130274316/130274316.html#bluetooth+low+energy+tutorial+pdf
    • http://renewalleave.com/uploads/1/3/0/6/130621022/f1b4c33ed5.pdf
    • http://prospectplumbingandgas.com/uploads/1/3/0/6/130640144/magoleda_gogivipiv_zevetajilixi.pdf
    • http://sitemove556.com/uploads/1/3/1/3/131379586/jubutovelikaxomalej.pdf
    • http://mail.sebolt.com/uploads/1/3/0/2/130288394/3555908.pdf
    • http://michelleprebilic.com/uploads/1/3/0/5/130589077/zukukotog.pdf
    • http://mail.vaporhauschicago.com/uploads/1/3/0/6/130603741/8758703.pdf
    • http://graduationtoretirement.com/uploads/1/3/1/8/131871744/5932325.pdf
    • http://michaelkitzes.com/uploads/1/3/1/4/131410736/246c42a486787.pdf
    • http://autodiscover.thesinglespoon.com/uploads/1/3/1/8/131856945/11c1afea.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005695.bin
4a4a8cc115893d80d46906718544f8889f50499439b328d161bba4ae949f69ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5695 5248 bytes
font_01_sfnt_off00006880.bin
c07b2ee479eed43a058d632de1fa18900484ecbaff3e7fa740540efdfc00b22f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6880 10108 bytes

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