Malicious PDF — malware analysis report

Static analysis result for SHA-256 55adaca655a50584…

MALICIOUS

PDF

66.6 KB Created: 2021-01-30 07:11:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 82e3d8f2928aa1eeef8a74c45d2ed714 SHA-1: 2a80ed91a5822f0cab1d7ac9afcd91b1c0d33ba7 SHA-256: 55adaca655a505846720d184430cdf176209bc8e08501325c876188b9cd8c1ba
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, identified as a link farm, directing users to various PDF documents hosted on external domains. This behavior, combined with ClamAV detection as 'Pdf.Phishing.Trojan', strongly suggests a malicious intent to redirect users to potentially harmful content or phishing sites. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7722

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://baarspo.ru/aws?utm_term=carcassonne+star+wars+english+rules+pdf PDF link annotation
    • https://cdn.sqhk.co/jemajujo/XUidhn8/dungeon_craft_tiles.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411001/normal_5ff0983da551b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427499/normal_5fe80b91e404e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380867/normal_5ffaa22694737.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451551/normal_5ff6a6281d690.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473023/normal_5fe049fc80521.pdfIn PDF document text
    • https://rabidibizuzej.weebly.com/uploads/1/3/4/6/134648686/medunasixigazo_korisifub_maluw_zegepadotatil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372383/normal_5fdf2cd74d8c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411480/normal_5fdc36b832a9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385014/normal_5fda425edf1af.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/pearson_mystatlab_quiz_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/26979033667.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD600 5416 bytes
SHA-256: a9fa12e9ba619ca641aa1861e9954acfc86880a9aa289f92955f131358fbc2a0
font_01_sfnt_off0000e879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE879 11220 bytes
SHA-256: 14eab7ecf5ea80edf4a3359b167189e50ea185a3f0a8310103f628f8fdc64211

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