Malicious PDF — malware analysis report

Static analysis result for SHA-256 55cda5c6ca6d2394…

MALICIOUS

PDF

64.1 KB Created: 2021-02-23 23:00:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ae2c99f07b865958c401167f57f09d2a SHA-1: 53eb67e8724e913bd68ea5fb6a78045f7d2378aa SHA-256: 55cda5c6ca6d2394aa4b0bcac582c4d54b3ce4389083fc6538495e42c118fa3e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary URLs points to 'bologen.ru', suggesting a malicious intent to redirect users. While no scripts were explicitly extracted, the PDF structure and the presence of many external links indicate a likely attempt to lead users to malicious or deceptive content, potentially as part of a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/aws?utm_term=ferrari+f40+lego+speed+champions PDF link annotation
    • https://kodabovoxalomas.weebly.com/uploads/1/3/5/3/135340354/718779.pdfIn PDF document text
    • https://gomamuna.weebly.com/uploads/1/3/5/3/135304292/deloliredukabev.pdfIn PDF document text
    • https://norofuzalugegok.weebly.com/uploads/1/3/4/8/134882219/c179501.pdfIn PDF document text
    • https://kuxubujokug.weebly.com/uploads/1/3/0/7/130775750/e20a24b4.pdfIn PDF document text
    • https://dosabaret.weebly.com/uploads/1/3/4/8/134861273/9627656.pdfIn PDF document text
    • https://banafazag.weebly.com/uploads/1/3/4/3/134325205/vodifet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384639/normal_5fd660a8aee02.pdfIn PDF document text
    • https://xazepobuzu.weebly.com/uploads/1/3/4/5/134582826/buforikekozave-liwokeni-wimuzan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493195/normal_5fdd851972d34.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/bubeto/bloodhound_gang_foxtrot_uniform_charlie_kilo_live.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/government_guideline_value_in_andhra_pradesh.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/hyman_invertebrate_zoology.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/98224618243.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/99081256826.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/ketifa.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/58997645980.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/18575367322.pdfIn PDF document text
    • https://s3.amazonaws.com/legobegutulo/bishop_s_hatfield_sixth_form.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/temoloratodadugo.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/62903493524.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/blank_skeleton_diagram_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/15332385241.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_off0000bd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD17 5752 bytes
SHA-256: 9fa6fa1847930be7c14e6ee274f1d1ad9af89f60d8d78c53402cf84693616869
font_01_sfnt_off0000d08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08E 10024 bytes
SHA-256: ddd9e6bbd0952b143be6ef916ce24bbe7951f6ea9713399b27e40d71700099f6

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