Malicious PDF — malware analysis report

Static analysis result for SHA-256 1501d557935c9fa4…

MALICIOUS

PDF

71.3 KB Created: 2021-06-06 08:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 0794c9d434c49fa21a61b300bfad9128 SHA-1: 48b5e9efcd577366d642db7317ef59c1b8f5c973 SHA-256: 1501d557935c9fa454177c7fd4c0def598f4124cb1f5253ee3d4439f30ca6167
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs pointing to other PDF documents hosted on various domains, some of which are disposable. This technique is often used for SEO manipulation or to distribute further malicious content. The presence of external links suggests an attempt to lead the user away from the initial document to potentially malicious sites or files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://queure.ru/pbw?utm_term=yaad+piya+ki+aane+lagi+song+download+mr+jatt PDF link annotation
    • https://gopelema.weebly.com/uploads/1/3/4/3/134314553/migovilon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464730/normal_6006a815d41bc.pdfIn PDF document text
    • https://vakuvovigoder.weebly.com/uploads/1/3/4/4/134467198/kizunolifo.pdfIn PDF document text
    • https://nevutero.weebly.com/uploads/1/3/4/7/134716167/minamaxoduk.pdfIn PDF document text
    • https://dovejopizodumu.weebly.com/uploads/1/3/4/8/134883147/zepevikurikobok-vefilaw-misokojopegu-bigos.pdfIn PDF document text
    • https://rovonowevon.weebly.com/uploads/1/3/6/0/136051941/lanopusiluze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475875/normal_5fda56a84dafe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427077/normal_5fdc41afb3aa6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421639/normal_60b86c63a295c.pdfIn PDF document text
    • https://vogobozonek.weebly.com/uploads/1/3/4/6/134667402/mugomuzovoxu_xareten_zabararusit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410222/normal_5fd0394f3bbd1.pdfIn PDF document text
    • https://poliradu.weebly.com/uploads/1/3/5/9/135991332/48bd9fc.pdfIn PDF document text
    • https://zejibepubik.weebly.com/uploads/1/3/1/0/131070590/5360829.pdfIn PDF document text
    • https://kobalogowitat.weebly.com/uploads/1/3/0/7/130776452/worejuxupa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459170/normal_5fcb9a82f1f60.pdfIn PDF document text
    • https://temaxamozasot.weebly.com/uploads/1/3/4/0/134096852/minitedoluvubabowuv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://laxaxufudej.pbworks.com/w/file/fetch/144600921/how_do_you_insert_file_path_in_excel.pdfIn PDF document text
    • http://jebusolole.pbworks.com/f/30694600812.pdfIn PDF document text
    • http://subazim.pbworks.com/w/file/fetch/144546978/zedawuvoruxizafuxibadibuv.pdfIn PDF document text
    • http://pagorevet.pbworks.com/f/xafaxezoxavepopafagaxoz.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_off0000d5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DC 5576 bytes
SHA-256: a7ee6c0dff26b86a091cb641cfbca0c9241c9b47bf390dd50eacd57dcaf0e1dc
font_01_sfnt_off0000e8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E5 11008 bytes
SHA-256: 32a3ad1c9c6fb1f8ba86aa36d60a7f7d19760f8f934ae4bab463968335a1a166