Malicious PDF — malware analysis report

Static analysis result for SHA-256 8918bb82681be093…

MALICIOUS

PDF

85.8 KB Created: 2021-02-17 04:34:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5d924b3581e9858c7d3c3e2c93722f0 SHA-1: b2014684edcc9fe46e92a285e3222fb1e0657995 SHA-256: 8918bb82681be093f489a5dcbf20ce778407ca6c78d8318037db86229556cc1f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, directing users to potentially malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to attacker-controlled infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/strik?utm_term=the+coldest+city+in+the+world+today
    • https://cdn-cms.f-static.net/uploads/4492246/normal_5fdb650949880.pdf
    • https://static.s123-cdn-static.com/uploads/4373301/normal_5fcc6de083f10.pdf
    • https://togimapobeno.weebly.com/uploads/1/3/4/6/134649298/f6dd682c4e781f.pdf
    • https://bogonifad.weebly.com/uploads/1/3/4/1/134108647/8017214.pdf
    • https://static.s123-cdn-static.com/uploads/4474752/normal_600906cd8d11e.pdf
    • https://dezilitew.weebly.com/uploads/1/3/4/7/134728488/pawepimipowageji.pdf
    • https://gutoxokotuvil.weebly.com/uploads/1/3/1/3/131380594/2280053.pdf
    • https://static.s123-cdn-static.com/uploads/4393359/normal_6006408541e58.pdf
    • https://static.s123-cdn-static.com/uploads/4404108/normal_5ff188a360fa4.pdf
    • https://cdn.sqhk.co/wepiwojeta/jjQhjij/15467782248.pdf
    • https://static.s123-cdn-static.com/uploads/4422909/normal_5ffda1874d255.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/megodipewukitoj/camera_360_vip_apk_mod.pdf
    • https://s3.amazonaws.com/jarawaxanivu/epiphany_piano_sheet_free.pdf
    • http://fufapawaxuta.rf.gd/22265394899.pdf
    • https://s3.amazonaws.com/dafumuxitupav/zelabanewexuj.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010323.bin
d00042b357e9b6bccf03042a3904d3a3f0781947d4e7cf10e73a9720e0c5c8d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10323 5168 bytes
font_01_sfnt_off000114c4.bin
d63aca480713fa61a11deb247f5aa9448cb0341254861b2485b6fe07b58c9f0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x114C4 17172 bytes