Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f81da1502e6d8d8…

MALICIOUS

PDF

89.3 KB Created: 2021-01-31 12:55:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: dd33b6370ad6b2b3ed314582883b2e37 SHA-1: 12f8939d675316a106b17e8a54cda26fdf05055c SHA-256: 3f81da1502e6d8d85f2a825506456b96a7c39bcd76219d46069504259b89619a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO poisoning or phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior, indicating an attempt to direct users to potentially malicious or deceptive websites. The embedded URLs and the ML classifier further support the malicious nature of this document.

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://leonvi.ru/123?utm_term=usb+cd+player+for+car PDF link annotation
    • http://mofizikozi.22web.org/suwewekadive.pdfIn PDF document text
    • http://petersikdar.com/gold_mountain_beauty_fungal_nail_eliminatorq6bm3.pdfIn PDF document text
    • https://renobikedasel.weebly.com/uploads/1/3/4/8/134897329/sonulojarofojuz.pdfIn PDF document text
    • https://vebunigujop.weebly.com/uploads/1/3/4/3/134367951/xijifo.pdfIn PDF document text
    • https://fakoronad.weebly.com/uploads/1/3/4/7/134712901/4801296.pdfIn PDF document text
    • https://ralirepiputup.weebly.com/uploads/1/3/4/8/134852471/4382788.pdfIn PDF document text
    • https://pomisefinare.weebly.com/uploads/1/3/4/9/134902228/ef7a7.pdfIn PDF document text
    • http://kungfumalibu.com/96420755422oqpcl.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/wutisigila/sasibumosexisavadojilik.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/cricket_bookie_software.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/54028889362.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/descendants_2_soundtrack_zip.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/boondocks_season_5_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/twitter_video_format_support.pdfIn PDF document text
    • http://zikefibuji.rf.gd/bootstrap_login_panel_template_free.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_off0001209a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209A 5384 bytes
SHA-256: 66cd895d03c54d8319fa1947d7a422ab2f06f49613f42e880cf147419d7d0e87
font_01_sfnt_off000132fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FA 10896 bytes
SHA-256: f0863f4e276d8471f62d0d40fd5dc519943f37c982700d65a3545574f1deaa66

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