Malicious PDF — malware analysis report

Static analysis result for SHA-256 689ee4accf1b9b06…

MALICIOUS

PDF

69.3 KB Created: 2021-01-12 11:04:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 3cebc6ecb69a071fbe32411d4e0fd1bf SHA-1: efe6c0d9eb2dec8c9b4b16e96f91144cab003040 SHA-256: 689ee4accf1b9b0684f4c0fa6c85e342aff4fb708234b95f822a85f759f3bf1e
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or redirection mechanism. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate malicious intent. The ClamAV detection further confirms this, identifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://trafficel.ru/aws?utm_term=android+9+wifi+authentication+problem PDF link annotation
    • https://zirorimasarikar.weebly.com/uploads/1/3/4/1/134108573/2250157.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426815/normal_5fc12e1360048.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479214/normal_5ff0311988b6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480732/normal_5ff9b7a746283.pdfIn PDF document text
    • https://site-1166601.mozfiles.com/files/1166601/8500507971.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375896/normal_5feb07991e899.pdfIn PDF document text
    • https://site-1172149.mozfiles.com/files/1172149/kidz_bop_world_tour_2019_live.pdfIn PDF document text
    • https://site-1180999.mozfiles.com/files/1180999/notepad_online_alternative.pdfIn PDF document text
    • https://misaxokur.weebly.com/uploads/1/3/4/3/134354007/norazojuvejagagiz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424696/normal_5fc644460a36d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375514/normal_5fb2799616a37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488339/normal_5fb5fb767d6d8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000d248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD248 5596 bytes
SHA-256: 5eb411e6b43e5c6f884264894227253d11e3bbcf00f29ae3995a513aaf1d9717
font_01_sfnt_off0000e532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE532 10404 bytes
SHA-256: dd5e03fade2bdbd023a104de300d3e2d7651ac310b91723d4c7e9cfc3f97c005

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