Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba12c4f54f73f655…

MALICIOUS

PDF

79.7 KB Created: 2021-02-24 12:29:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 156d95bf74af4209f494ecdaac4e7040 SHA-1: cd2650a893cbbd9763987733faab615c7c017a69 SHA-256: ba12c4f54f73f65514b7c9c07cbcf88ed56c17ba0b1e06fa66695296f8d0046f
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs pointing to disposable domains suggests a phishing or credential harvesting campaign. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites, likely for further exploitation.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://baarspo.ru/aws?utm_term=how+to+reset+a+honeywell+wireless+thermostat+cm927 PDF link annotation
    • https://lufuwoxataj.weebly.com/uploads/1/3/1/3/131379696/8871078.pdfIn PDF document text
    • https://mazokaru.weebly.com/uploads/1/3/5/3/135303974/8e6baaf1f.pdfIn PDF document text
    • https://bapefakujina.weebly.com/uploads/1/3/4/4/134483882/xoduxik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370780/normal_5fe91d6fd9b18.pdfIn PDF document text
    • https://vazigawexike.weebly.com/uploads/1/3/1/6/131606690/7680249.pdfIn PDF document text
    • https://linajijokib.weebly.com/uploads/1/3/4/0/134000065/8165310.pdfIn PDF document text
    • https://cdn.sqhk.co/motuxeneb/Djb4egj/5877014085.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380080/normal_5fe79e0c81259.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387715/normal_5ffae28a900f4.pdfIn PDF document text
    • https://tutupofu.weebly.com/uploads/1/3/0/9/130968911/nevuwozeka.pdfIn PDF document text
    • https://romevezijije.weebly.com/uploads/1/3/4/7/134756673/4333141.pdfIn PDF document text
    • https://xivapumi.weebly.com/uploads/1/3/1/6/131606059/4941779.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426413/normal_5ffe67fdc0ba1.pdfIn PDF document text
    • https://cdn.sqhk.co/vofonowul/ciegcih/whatsapp_messenger_rooms_uitzetten.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419425/normal_600ec2926b510.pdfIn PDF document text
    • https://tugufotekaluxaz.weebly.com/uploads/1/3/4/8/134883762/rujipudimuguxekixib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7ED 5564 bytes
SHA-256: 6c77476cbab26fc153636d55541c3e1f3ca80b9ccdc4012848188e78d1b48a31
font_01_sfnt_off00010ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC3 10732 bytes
SHA-256: eb22fba85b11cd1101a0f9946ddb1d9c39176b1d538092b147f24210e56c637c

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