Malicious PDF — malware analysis report

Static analysis result for SHA-256 faf4ecc27bd5f3ff…

MALICIOUS

PDF

71.2 KB Authoring application: pdf-parser
MD5: 8f564863dd626e143581798dc488dda5 SHA-1: df5ec409324527111dd72586b81e756bb060df8e SHA-256: faf4ecc27bd5f3ff8a02aed0440039cc043d58ad3d8f53f0f54b4ee686c6dc6f
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ClamAV detection also flags this as phishing malware. The document body contains text related to 'Solving systems of equations with matrices worksheet answers' which appears to be a lure to disguise the malicious intent of linking to numerous other PDF files hosted on various domains.

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.
  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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://www.nyanyanizhniynovgorod.ru/uploads/1/3/0/4/130436188/59ba001fac54762.pdf
    • http://salemalchemist.com/uploads/1/3/0/7/130739133/4595d9510f85.pdf
    • http://mobileoct.com/uploads/1/3/0/2/130270863/dologi_zewilaxoluwad_ratujemez.pdf
    • http://kcfearfarm.net/uploads/1/3/0/4/130483631/873e03cde8348f.pdf
    • http://transposemag.com/uploads/1/3/0/3/130379353/972a2e107f.pdf
    • http://rsmworkplace2020.com/uploads/1/3/0/6/130639077/fuzosevavivan.pdf
    • http://machomama.net/uploads/1/3/0/7/130775221/6314a55.pdf
    • http://montcoglass.com/uploads/1/3/0/4/130489185/3526586.pdf
    • http://mrswoodworth.com/uploads/1/3/0/4/130488850/5991d.pdf
    • http://oklahomatraffictickets.com/uploads/1/3/0/3/130313718/93d9cceec.pdf
    • http://charmingworldtours.voyagerwebsites.com/uploads/1/3/0/8/130813785/130813785.html#solving+systems+of+equations+with+matrices+worksheet+answers

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001332.bin
4818432607e2e00f11497ce9d779f1e712e08a845fd5dca1f1ad4ae2589a46d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1332 9668 bytes
font_01_sfnt_off0000cb3e.bin
83459e82cebe561b9e65dda6a09953c9e35f75e5df0fa62a624e1833cc5b8086		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3E 1708 bytes
font_02_sfnt_off0000d336.bin
cf2338b7895a3a873add1db7dfb411390262a2a3d24e5b3dccff59843624ea97		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD336 2704 bytes

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