Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3bcb2c2801c8456…

MALICIOUS

PDF

72.5 KB Created: 2021-03-03 10:57:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 5da16ff94a24785434d39292b54ca858 SHA-1: 4793fc4f0c6f3e11356b9be9cdf8c780ae44f4e8 SHA-256: d3bcb2c2801c8456dd504dfc04f9a42c4db0a1138e798087f02e99ca0aac5d30
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links, forming a link farm, with one prominent URL being https://maypoin.ru/strik?utm_term=skywalker+15%2527+round+trampoline+pad. This suggests the document's primary purpose is to redirect users to potentially malicious or phishing websites.

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://maypoin.ru/strik?utm_term=skywalker+15%2527+round+trampoline+pad PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450876/normal_6035ee2927d3d.pdfIn PDF document text
    • https://gozerezujokosas.weebly.com/uploads/1/3/4/8/134856803/1224304.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375361/normal_602bf6fc52600.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417129/normal_602e376d1580e.pdfIn PDF document text
    • https://jobadenel.weebly.com/uploads/1/3/1/1/131164033/tuzub_balepimuguw_wokuf.pdfIn PDF document text
    • https://kilejotiwig.weebly.com/uploads/1/3/1/4/131406519/defema.pdfIn PDF document text
    • https://varozifan.weebly.com/uploads/1/3/0/7/130740200/9200a09a398.pdfIn PDF document text
    • https://gozawufi.weebly.com/uploads/1/3/1/3/131398332/wegewikegekibulenuz.pdfIn PDF document text
    • http://mozuganimaf.66ghz.com/maralexorikogakefifuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453333/normal_6010cabe01b01.pdfIn PDF document text
    • http://jurojegame.getenjoyment.net/how_to_check_tcp_ip_stack.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kefodek/72314787342.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/sizijogagevadudolifas.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/aua_guidelines_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/sp_balasubrahmanyam_songs_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/vubenofifivo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04E 5380 bytes
SHA-256: b548c0303f3405351e37b6995f4214fdfcb7b2aa3c1f8df5961af9472e21bc60
font_01_sfnt_off0000e29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29A 10700 bytes
SHA-256: f787b654165c0ff6079d43d389afd7e5723f6192373a5bd1edcce9a75878e539
font_02_sfnt_off000106f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F8 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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