Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4120b4bb767c912…

MALICIOUS

PDF

68.9 KB Created: 2021-01-03 13:49:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 9a1085d969565bbd941d9036c44085d8 SHA-1: 72730640b51b7bc7038e1892c9fa171db1bf1337 SHA-256: c4120b4bb767c912885a07245880d5d4e1d7e4aa74db6be168d8cc1d1920058c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on link farms, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://trafficel.ru/aws?utm_term=software+arcgis+9.+3+free PDF link annotation
    • https://cdn.sqhk.co/dizoketa/lgfhfij/24741182167.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvexudid/LhfhFjf/6111347961.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367625/normal_5f87572b1c80f.pdfIn PDF document text
    • https://denosuzasagi.weebly.com/uploads/1/3/2/7/132712615/sotalurur-dafowil-wexavomirexum-kufiruv.pdfIn PDF document text
    • https://cdn.sqhk.co/xinulezebi/gfgfvhd/cute_pikachu_wallpaper_4k.pdfIn PDF document text
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/4746560.pdfIn PDF document text
    • https://kunisalopug.weebly.com/uploads/1/3/4/3/134315348/ropisovivu_nonefipo_badarilijarid.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwufupi/hfAcfjf/blockman_go_mod_apk_unlimited_gcubes_2020.pdfIn PDF document text
    • https://gozisali.weebly.com/uploads/1/3/4/6/134670052/2ad93979.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422148/normal_5fc0a306c3ad2.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/57a72bb7-5b82-41ff-b3df-f68492f74de7/funalog.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_off0000cf7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7C 5564 bytes
SHA-256: 3a83a9499206f7144b45ebbded3254c7d38079c9d2e45d5a0d81bb587fd033f8
font_01_sfnt_off0000e29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29B 10600 bytes
SHA-256: 8ab360ce9d709a6259b359ff25b7c21110c771ce1f895a81bf0e098f70b39379