Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c1b2e349d0c82e6…

MALICIOUS

PDF

68.9 KB Created: 2020-11-18 04:10:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7e346900858854a9bbd4f7c33fb51e41 SHA-1: d863f3c1488022f9a8c7d8251b86822f79dc053b SHA-256: 0c1b2e349d0c82e6d636fb43a5302731f7e2dd424231e129b59e9f5c916db0af
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://traffine.ru/aws?utm_term=carers+leave+application+form PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379035/normal_5f8f00268aed7.pdfIn PDF document text
    • https://minuzivajod.weebly.com/uploads/1/3/4/3/134354575/5449855.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369185/normal_5f8fbec654934.pdfIn PDF document text
    • https://lonunibulitog.weebly.com/uploads/1/3/4/4/134498578/6b5bf1b06571.pdfIn PDF document text
    • https://zirufifun.weebly.com/uploads/1/3/0/8/130874679/8076346.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421944/normal_5f979de758122.pdfIn PDF document text
    • https://zidabowejixu.weebly.com/uploads/1/3/1/1/131163559/7446280d.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/vavabi/2305751064.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/fantasy_nails_usa.pdfIn PDF document text
    • https://s3.amazonaws.com/bexolamabad/sally.exe_online_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5557cca4-a1dc-4261-8aaf-bf7de9f25bee/o_numero_de_adexe_e_nau_de_whatsapp.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/piwabirir.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/brantford_weather_report_7_day.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_off0000d201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD201 5128 bytes
SHA-256: 27bb66e501b59ceb2a8da2284f4487c4fdbee85ff3e095ac0c55fe6a6c35a432
font_01_sfnt_off0000e363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE363 10432 bytes
SHA-256: 87ac67bda0fea072afb1d6c55f060195e55ca8085e36269c3868f1a75a446194