Malicious PDF — malware analysis report

Static analysis result for SHA-256 e63436e97e868a8c…

MALICIOUS

PDF

74.0 KB Created: 2021-06-11 07:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3b0e083ef5f89fb57f68801bf466debd SHA-1: cf299ae257e600c7ea92d141749e6c41d3149923 SHA-256: e63436e97e868a8c195d106fd536eb04939e2242ef1290308e2691c1160c74ce
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It 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, contains metadata related to 'wkhtmltopdf' and a date, but no clear textual lure. The primary attack pattern appears to be directing users to a network of external URLs, likely for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crysiq.ru/pbw?utm_term=os+x+el+capitan+to+mojave PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4477367/normal_5fcc2ea54296e.pdfIn PDF document text
    • https://ridewavovelomu.weebly.com/uploads/1/3/4/6/134697160/c34a9d2.pdfIn PDF document text
    • https://xeludopoveju.weebly.com/uploads/1/3/4/5/134528604/2947392.pdfIn PDF document text
    • https://jamelowo.weebly.com/uploads/1/3/1/6/131606155/d126fd4a84.pdfIn PDF document text
    • https://kudiwugeditonaf.weebly.com/uploads/1/3/5/9/135964520/59f91be7ccf.pdfIn PDF document text
    • https://xadijonoru.weebly.com/uploads/1/3/3/9/133997446/tavetason_bamelituguw_niverobejudegit_juzagesevit.pdfIn PDF document text
    • https://verulezame.weebly.com/uploads/1/3/0/8/130814285/646593.pdfIn PDF document text
    • https://riragipus.weebly.com/uploads/1/3/4/3/134358734/673cbb4721.pdfIn PDF document text
    • https://dujejasafat.weebly.com/uploads/1/3/0/7/130739214/rozupijunimefav-reloruvagale.pdfIn PDF document text
    • https://kinikike.weebly.com/uploads/1/3/5/3/135324172/gurutanawetotuva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390642/normal_605f70f8999e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377408/normal_60610a6a8be72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482399/normal_5fdfc6256e8c0.pdfIn PDF document text
    • https://pamesatigifimes.weebly.com/uploads/1/3/4/6/134639420/2703198.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vugufosenene.pbworks.com/f/55494193126.pdfIn PDF document text
    • http://sodopateduke.pbworks.com/f/sibaz.pdfIn PDF document text
    • http://papoxuva.pbworks.com/w/file/fetch/144826176/how_to_make_live_usb_ubuntu.pdfIn PDF document text
    • http://kenoxipej.pbworks.com/f/14563026459.pdfIn PDF document text
    • http://ronakiko.pbworks.com/w/file/fetch/144552987/47832240707.pdfIn PDF document text
    • http://gipomebepate.pbworks.com/w/file/fetch/144582993/75961846305.pdfIn PDF document text
    • http://dadilotofexi.pbworks.com/f/fashion_photography_portfolio.pdfIn PDF document text
    • http://vugufosenene.pbworks.com/w/file/fetch/144446322/56048063802.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_off0000e4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A7 5212 bytes
SHA-256: 175583e96a1204e7aea50cc5711331ea2c3641705b735aaba5d1915a52da271e
font_01_sfnt_off0000f664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF664 10620 bytes
SHA-256: e5a02908003cbd213f1d138fd566a8a9380e058cd350e0869c02d9716a5ca0d5