Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f97ce8da8deef12…

MALICIOUS

PDF

39.2 KB Created: 2020-06-25 07:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4be668bd4079224b1e8b392bee2dc04 SHA-1: a7e66174f463b81bca7ce951c46a3196f1d92b77 SHA-256: 1f97ce8da8deef1246f30dfe1546e2c47b27ab9f1d23746fbb12649c040c87b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links to other PDF files hosted on various domains, indicative of a link farm or redirection scheme. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute further malware or phishing content through these linked PDFs. No scripts were extracted, so the exact payload delivery mechanism beyond the link farm is not discernible from this sample alone.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.Dropper.Agent-9243042-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-9243042-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://shopathairskinandmakeup.com/uploads/1/3/2/6/132695392/132695392.html#gps+post+processing+tutorial
    • http://diversifiedconsultingcooperative.org/uploads/1/3/0/3/130379352/pilofejifu.pdf
    • http://saletacoma.com/uploads/1/3/0/6/130621361/2802da.pdf
    • http://centrallyesl.com/uploads/1/3/0/8/130874162/1272587.pdf
    • http://aaoccseminary.com/uploads/1/3/1/3/131398487/tufesa-guropavuwarav-fokelurel.pdf
    • http://michaelkitzes.com/uploads/1/3/1/4/131410736/246c42a486787.pdf
    • http://mta-sts.mx.topionline.com/uploads/1/3/1/0/131071295/186032c4b284859.pdf
    • http://cicchiservizi.com/uploads/1/3/1/1/131163834/5246984.pdf
    • http://windows7upgrade.us/uploads/1/3/0/5/130589313/vekerato-fitape-wupovinu.pdf
    • http://wellnessbethechange.com/uploads/1/3/0/4/130488338/sugumujavitaja-fopuzifujonidud.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_off00005ad9.bin
12b57dfc98d8e59ff00dfa3f2c7485ce7eb78b529104a2de3a85f973c229cfb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AD9 5016 bytes
font_01_sfnt_off00006c03.bin
b8203c4cdf4f43bde510b5bff78b59a6909c3a8ffaf84122f65af4f3cf2c616f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C03 10672 bytes

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