Malicious PDF — malware analysis report

Static analysis result for SHA-256 b386bae68bf377a0…

MALICIOUS

PDF

73.9 KB Created: 2020-12-28 06:06:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: f650115628ebbedfbbb9ac495aefdc60 SHA-1: bef28c330479419f37d703901e9f526f1e248c45 SHA-256: b386bae68bf377a01cc0e1751325696a4a2ac266d5b761924cca14541267361d
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. The embedded URLs, such as 'https://traffnew.ru/aws?utm_term=calendario+2019+para+imprimir+pdf+completo', are likely used to direct users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/aws?utm_term=calendario+2019+para+imprimir+pdf+completo PDF link annotation
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/masozifunobiwot_vigizibevov_bekozizizavu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505771/normal_5fb32f906bbe9.pdfIn PDF document text
    • https://datamabijiremu.weebly.com/uploads/1/3/4/6/134691522/2435648.pdfIn PDF document text
    • https://jujepuwajepoxox.weebly.com/uploads/1/3/4/4/134466337/9f6bb.pdfIn PDF document text
    • https://sujeliduk.weebly.com/uploads/1/3/4/5/134584652/xadexepu-pavebaz-pajurexisa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446507/normal_5fcc6145905f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465924/normal_5fcd9918455be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488809/normal_5fce5d443acb0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426267/normal_5fe23fafec560.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/lowuwofuxali/financial_accounting_and_reporting_book_philippines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b912be88-6680-4564-8ad4-0c68b7e9d590/hard_sun_eddie_vedder_lyrics.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_off0000e16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16A 5508 bytes
SHA-256: 6f42367121fea5747b76af32c2c8b67947d10385108d24f405828d252be023f7
font_01_sfnt_off0000f40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40F 11356 bytes
SHA-256: c0f93a018149d35d49644423abba962f301144a7227a482a72e6568773edaab2

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