Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae0a486c57f30e86…

MALICIOUS

PDF

90.3 KB Created: 2020-12-16 23:07:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: c90cdbc4bd7d4f2fe13ecffe16cd9ff6 SHA-1: 197e4ab0de33e6e1bb482c8692f7d8c8bbdc5c1c SHA-256: ae0a486c57f30e86bb6ea2d4d8e94798dc1cb9263e91635bffcd512ffa2f8f1a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a malicious document designed to redirect users to potentially harmful sites.

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://traffnew.ru/123?utm_term=distress+tolerance+skills+workbook+pdf PDF link annotation
    • https://xosotujusosevo.weebly.com/uploads/1/3/4/3/134377620/vawajabuxa_kurelixun_dozetemo_kovaguxomunifu.pdfIn PDF document text
    • https://kerumesuni.weebly.com/uploads/1/3/4/1/134131613/7420505.pdfIn PDF document text
    • https://zafasasuk.weebly.com/uploads/1/3/4/7/134713251/3447058.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/wumodukubaru/current_weather_report_in_tamil_nadu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2ac42a5bc066edfb10807/t/5fc447c1e6d49a06bb1ab4e0/1606698945778/hidden_cloud_village.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fceec890cd30a4efbe446dc/t/5fd04f4eab2d482295da947b/1607487311393/16456109834.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc66ebfbda9c57a97e41709/t/5fceb5d5c463130800a7011d/1607382488270/counter_terrorist_game_for_pc_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/calendario_judio_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b96b9459-f1e2-4b26-8b42-253a0a5b91a1/71836120223.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0eb456b97992eb55c2a22/t/5fd1a4b47cf94534dc582221/1607574709840/steam_downloader_io.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd038bd334513fae42f201/1606222732551/gewumovopakojotapun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21690e5a-0607-4674-bbdf-20009ab859cf/vulasamobofimi.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_off0001244b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244B 5444 bytes
SHA-256: 0a36a30d7c14e0c75f03a189416fbf90d145c42af1949e820453a9acb178c3ff
font_01_sfnt_off000136ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136ED 10832 bytes
SHA-256: b1cadde56419ddc0823a1a7d2991255c6aa505076ef2b48a7bfc8034a2be86dd

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