Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ee2df08013e71d9…

MALICIOUS

PDF

129.8 KB Created: 2021-06-13 02:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 8b869c7041af35c431e30a1eeadb26f5 SHA-1: 156a8e64e77782ee59a63093ef7fd86aa062c1dd SHA-256: 4ee2df08013e71d903ba160856b6caa43bdf968998cd248759a0bc37869ed06a
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to song downloads. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with a high ML classifier score and ClamAV detection, strongly indicates malicious intent. The primary goal is to redirect users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://wastran.ru/pbw?utm_term=amitabh+bachchan+a+to+z+mp3+song+download+pagalworld PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465935/normal_60054b6c8ed31.pdfIn PDF document text
    • https://bijifejutumaxob.weebly.com/uploads/1/3/1/3/131381781/1340277.pdfIn PDF document text
    • https://mesenogixu.weebly.com/uploads/1/3/4/7/134736765/9891346.pdfIn PDF document text
    • https://fukoxifixe.weebly.com/uploads/1/3/4/4/134460993/ronaji.pdfIn PDF document text
    • https://lulakoxefinadi.weebly.com/uploads/1/3/4/3/134332070/8463109.pdfIn PDF document text
    • https://wefanuku.weebly.com/uploads/1/3/4/6/134611064/6a2978410afcd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426960/normal_602c5919400a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424341/normal_6006214a41928.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389824/normal_60c53e90aa39c.pdfIn PDF document text
    • https://rivewatot.weebly.com/uploads/1/3/3/9/133999312/pexewipopa-xusafonolefa-xeburugub-xogove.pdfIn PDF document text
    • https://jedexapotup.weebly.com/uploads/1/3/4/4/134472831/wufukirofosudu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448339/normal_602df1842a254.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409403/normal_5fe0ec8b5ac86.pdfIn PDF document text
    • https://sopowifumerage.weebly.com/uploads/1/3/4/3/134355846/4950505.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451210/normal_5fe6daeba3da1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386851/normal_605ff4ca64494.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491965/normal_5fe3e24eb2c3f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388426/normal_5fc82792eb0ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490369/normal_604aa748de84c.pdfIn PDF document text
    • https://talebizipuvi.weebly.com/uploads/1/3/1/4/131483067/a22b9946830f0.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/07e2e7f3-0935-475a-8e6e-b4074ffc8ed1/carta_para_mi_marido_de_cumpleaos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ef7b470-a4f6-4e8b-8486-602a709904e4/star_wars_kotor_korriban_walkthrough.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_off0001bd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD75 5924 bytes
SHA-256: ba0247e2345298dad251a8167006d55e8e1948168e317bcafc005bbb95727a98
font_01_sfnt_off0001d182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D182 11844 bytes
SHA-256: b1c8b0c152c495e3df6f4ec2a3e2c02899af9c4d8999e97ee1c7e2b26dee66b0