Malicious PDF — malware analysis report

Static analysis result for SHA-256 9846ad33499b9be5…

MALICIOUS

PDF

69.2 KB Created: 2021-03-20 12:14:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 7c0ed6f88b911c8da2d1d30750a11170 SHA-1: 201fadb22b20359a1f24de68074658ffb575b9e1 SHA-256: 9846ad33499b9be51eb15cb41fdebacd91b97fdbdef42f39dfbc9aafb2203a13
156 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ClamAV and an ML classifier, and it contains a large number of external links, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to be a lure related to 'common core algebra 1 homework answer key'. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to redirect users to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://jacksth.ru/123?utm_term=common+core+algebra+1+homework+answer+key PDF link annotation
    • https://mifopezuzata.weebly.com/uploads/1/3/4/4/134484464/4291013.pdfIn PDF document text
    • https://wopirizebopate.weebly.com/uploads/1/3/1/4/131452778/e10c798b1a531.pdfIn PDF document text
    • https://dawekemukodo.weebly.com/uploads/1/3/4/4/134491409/dapaliz_lekiniw.pdfIn PDF document text
    • http://lapuxuzogu.22web.org/zich_informeren_over.pdfIn PDF document text
    • https://tomasuniraruz.weebly.com/uploads/1/3/5/3/135392941/6195781.pdfIn PDF document text
    • https://finedogu.weebly.com/uploads/1/3/4/7/134749629/gajuzeva.pdfIn PDF document text
    • http://nabavawuzafurur.mygamesonline.org/does_dyson_have_sales_on_black_friday.pdfIn PDF document text
    • http://wogamilip.iblogger.org/telangana_armoor_weather_report_please_google.pdfIn PDF document text
    • https://xoxajunun.weebly.com/uploads/1/3/4/3/134351876/4685637.pdfIn PDF document text
    • http://xazusifiwo.iblogger.org/linux_shell_script_tutorial.pdfIn PDF document text
    • https://naxozafo.weebly.com/uploads/1/3/1/4/131483391/9991237.pdfIn PDF document text
    • http://deladinabixek.sportsontheweb.net/penepamabekavis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vumamuv.myartsonline.com/tedexevazaj.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/23101138335.pdfIn PDF document text
    • http://zipifuxe.epizy.com/konejijudofavonovixidon.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/los_patitos_feos_boris_cyrulnik.pdfIn PDF document text
    • http://lapabogi.rf.gd/defozevamak.pdfIn PDF document text
    • https://s3.amazonaws.com/sogovekevi/what_does_parkour_stand_for.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/bachelor_night_full_movie_tamil_dubbed.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/ruloju.pdfIn PDF document text
    • http://menovuxitunejo.rf.gd/99072611932.pdfIn 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_off0000cff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF2 5568 bytes
SHA-256: 345d30e19474c8f7f8a40c323a9cc833f7a137d0d547bcc7bc30dc7706026884
font_01_sfnt_off0000e2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CB 10840 bytes
SHA-256: 39cddeb678301444b43904ed2897d3ec476f29bee3581474e9e0ac1581acf9b4

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