Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a712f3a3344fb05…

MALICIOUS

PDF

41.4 KB Created: 2020-03-25 02:44:31 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 971b4cb03232650399ee6613f6640e03 SHA-1: ed50fbb8d14e6cd0857796189126fcd7d5fa8deb SHA-256: 8a712f3a3344fb053e00eb7f3f4d668c5e0535542b99be09ec9e230c3f72755a
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains. This pattern is indicative of SEO poisoning or a link farm designed to distribute malicious content or redirect users to phishing sites. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body text is largely unreadable binary data, but the presence of numerous external links is sufficient evidence for the attack pattern.

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://klokkeraadgivning.com/uploads/1/3/1/0/131070313/131070313.html#musculo+que+esta+entre+el+cuello+y+el+hombro
    • http://kemafamilyptyltd.com/uploads/1/3/0/4/130436450/938459caf06fa78.pdf
    • http://mhentscheldesigns.com/uploads/1/3/0/2/130273799/8bd6c68383f99.pdf
    • http://120lakeshoredrive.com/uploads/1/3/0/6/130604685/8926591.pdf
    • http://m3det6.com/uploads/1/3/0/7/130775203/karasa.pdf
    • http://mta-sts.ciarakidder.com/uploads/1/3/0/6/130621098/tiporan.pdf
    • http://mail.celebratinggodscreation.com/uploads/1/3/0/4/130436007/ronamubowud.pdf
    • http://midwesthomesteadsupply.com/uploads/1/3/0/8/130873965/sajalarefijovujerud.pdf
    • http://demolitioninphoenixaz.com/uploads/1/3/0/6/130621581/nurixibalal.pdf
    • http://vesuviusisforlovers.com/uploads/1/3/0/5/130543798/muzusigituga.pdf
    • http://playtherapyonlinetrainingacademy.com/uploads/1/3/0/2/130288348/a65e2c474.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_off00006c26.bin
f4c0f20afc1741f7ce96cde28c78e288e073c6d49ad37fa18b4f7113c69c793a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C26 7976 bytes
font_01_sfnt_off00008973.bin
885781ec91db75dc8c4a6a3d3dac0324bdfdb8f2239dab70466c62035ae072da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8973 4144 bytes

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