Malicious PDF — malware analysis report

Static analysis result for SHA-256 679da78853b7e30a…

MALICIOUS

PDF

70.6 KB Created: 2021-03-01 06:10:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 6fd0015d705334b84b029da659ed8bf9 SHA-1: 745eb40025af7632b41bedfdca56da123f480f2a SHA-256: 679da78853b7e30a132243188a52f0a8cbf2a3598c32d23052b7b2802bea1060
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The presence of a malicious ClamAV detection and a high ML classifier score further indicate malicious intent. The document body is heavily obfuscated and appears to be corrupted, preventing a clear understanding of its direct lure, but the link farm strongly suggests a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9545

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://zajinet.ru/strik?utm_term=diamond+sutra+quotes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365653/normal_600dfad12f5ed.pdfIn PDF document text
    • https://wiluxuvofox.weebly.com/uploads/1/3/0/9/130969019/1958504.pdfIn PDF document text
    • http://gutagige.sportsontheweb.net/zakej.pdfIn PDF document text
    • http://kifopelidito.mypressonline.com/gokixelijovuvopi.pdfIn PDF document text
    • https://lonumuzab.weebly.com/uploads/1/3/4/2/134234730/ea21363a4e6f9.pdfIn PDF document text
    • http://zabemaladameg.medianewsonline.com/broadcom_ush_driver_e6520.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/waxegatulo/rekibesubukipozubituzerok.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/31460581164.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/the_swatch_group_ltd_annual_report.pdfIn PDF document text
    • http://fejagokebaneril.epizy.com/luzikita.pdfIn PDF document text
    • http://xomexopiguv.rf.gd/cbse_improvement_exam_2019-_20_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/voxif.pdfIn PDF document text
    • http://damikofem.rf.gd/honeywell_wireless_focuspro_6000_system_kit.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD7 5064 bytes
SHA-256: 8d51d80b3b546081aae856a248dbeb2f20fe88704341035370e99e84c4ec15a2

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