Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33edd123b49e268…

MALICIOUS

PDF

75.9 KB Created: 2021-04-05 05:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 774ce7b50bc2093c89dd40ec8618735e SHA-1: b2774572d16db42d9dc5e296a83b34a85ad5056c SHA-256: b33edd123b49e2682180555a0f4ee833a3b7268b0660599ee4ad8a0c39762270
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical detection for a link farm and ML classification. It contains numerous external links, with one pointing to vilenefex.ru, suggesting an attempt to redirect users to potentially malicious sites. The document body is heavily obfuscated, but the presence of PDF_SEO_LINK_FARM indicates a large number of embedded links, likely for SEO manipulation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/wix?keyword=symcode+1d+barcode+scanner+manual PDF link annotation
    • https://doxibizogo.weebly.com/uploads/1/3/4/8/134893922/9764321.pdfIn PDF document text
    • http://astrology-personal.online/99359510756hawdu.pdfIn PDF document text
    • https://kikuvutu.weebly.com/uploads/1/3/5/9/135965216/gabexonuno_sizibibeboku.pdfIn PDF document text
    • https://ruwitopiramowu.weebly.com/uploads/1/3/4/3/134364975/5075776.pdfIn PDF document text
    • https://sipebiwamedewor.weebly.com/uploads/1/3/4/7/134707389/ferexo.pdfIn PDF document text
    • http://qrettalq.online/sadiximorakenaneteruvyo8vi.pdfIn PDF document text
    • http://arthromedshop.xyz/fighter_battle_master_5e9rbrf.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://wojisub.mypressonline.com/list_of_state_capitals.pdfIn PDF document text
    • http://jebonefawudo.sportsontheweb.net/semibofufenojovezuwot.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/defipedibe/nuwebibidurar.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/tonejomos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e57f2a22-ba13-4164-8e7f-f4318df7cad0/45292471195.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dbb0811-c7ef-44c1-b9db-7cd4918e129e/10063259949.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/77507247063.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/89551519630.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/045a7f87-517f-4ea8-95a5-f000a7667901/jonopomadijarosomawiba.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/50486283006.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_off0000eb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3A 5484 bytes
SHA-256: dce2807961ede947bb441a31243c462662d7d77a7121f97720e04f71cbbecbaa
font_01_sfnt_off0000fdce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCE 10768 bytes
SHA-256: 55551e0c53a00239eff9a3fe017657342f8018563a2bd046e202b44793e31fd2

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