Malicious PDF — malware analysis report

Static analysis result for SHA-256 a43a39dbb4c33bbe…

MALICIOUS

PDF

72.0 KB Created: 2020-12-17 07:56:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1dfd94c77da19b2cde3c3e0430869192 SHA-1: ed039faa20628f304e394dd587b115931c66bf06 SHA-256: a43a39dbb4c33bbed42b896e33a465cd804740de7f7928043ca571b7ee5b8f54
214 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. Although the document body is heavily obfuscated, the presence of a link farm and a redirector suggests the primary goal is to direct users to malicious sites, likely for phishing or to download further payloads.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/123?utm_term=ghirardelli+triple+chocolate+brownie+mix+cake+recipe In PDF document text
    • https://cdn-cms.f-static.net/uploads/4425504/normal_5f9da4dcaedcf.pdfIn PDF document text
    • https://zisatusomet.weebly.com/uploads/1/3/4/8/134872515/sifus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444102/normal_5fc1caea1d47b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_5f8c467b7c636.pdfIn PDF document text
    • https://nikuwexipamojag.weebly.com/uploads/1/3/0/8/130813731/makazobiweginif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e89c549c-8c14-4a15-88c3-498a6b071608/fetazikuravomabenokirufal.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc565982e537a05ef2721af/t/5fc8322d2dd5737571ab3535/1606955565616/dosukirabu.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/wakezekimugoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4512be5c-ac6f-4479-ad1e-bab5baa33764/perk_guide_ngu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/693ab6c9-eb02-45ef-b46f-ad4ee7796923/tutupojugaxenom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6131ccc-0686-4353-b205-873bd0a42f68/because_the_internet_screenplay_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf6a933f75b16643cd8d6d/1606380180192/babejopavujir.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/povemerivuxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71e9646f-4efb-43a4-9614-04e3d3a51ae0/iowa_out_of_state_teaching_license.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_off0000d9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D7 5532 bytes
SHA-256: 87b876b37d462c93ec46cf995cf69d3965936658611edf3440a4208eca76611a
font_01_sfnt_off0000ec85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC85 11416 bytes
SHA-256: 7192f95ba29654f77af51639e2c10936c503fb2578fd2ca030e15aac37fc4962

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