Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ecd7dfd0f23397a…

MALICIOUS

PDF

70.2 KB Created: 2021-06-12 19:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8f9b84e4bbf03e567244eb2bb7ef9bab SHA-1: 0a079618854ba1c57ada2b452590e590a8a9a3e9 SHA-256: 3ecd7dfd0f23397a931ebf2f5e2ee5236ca47cfe32adb7b54770d2118e9bfc59
186 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various external PDF files, one of which is a Minecraft APK download. The presence of numerous external links hosted on disposable domains suggests a phishing or malware distribution scheme designed to attract users through search engine optimization tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=minecraft+apk+14.4 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384647/normal_6051fd7b22d2f.pdfIn PDF document text
    • https://mevenuma.weebly.com/uploads/1/3/4/3/134380719/lofenesidel.pdfIn PDF document text
    • https://xewixubigikuj.weebly.com/uploads/1/3/4/8/134892453/4919328.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490934/normal_5ff1cd3e691d6.pdfIn PDF document text
    • https://kitejunozog.weebly.com/uploads/1/3/4/3/134319277/6375679.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479224/normal_5ff0f3e1e1e24.pdfIn PDF document text
    • https://kegefotog.weebly.com/uploads/1/3/1/3/131398129/2701605.pdfIn PDF document text
    • https://beripetalodewug.weebly.com/uploads/1/3/4/8/134865824/faginotovexetidube.pdfIn PDF document text
    • https://pibigetikuke.weebly.com/uploads/1/3/5/3/135387636/1620322.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382196/normal_5fd0308245f7e.pdfIn PDF document text
    • https://malabukepi.weebly.com/uploads/1/3/0/9/130969546/wumedosovavud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483591/normal_60087142ac8f6.pdfIn PDF document text
    • https://zesujixiti.weebly.com/uploads/1/3/1/3/131398447/bozedofixem-ruzepu.pdfIn PDF document text
    • https://zufinoresazoso.weebly.com/uploads/1/3/4/7/134711963/440bd2fbaacb649.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421764/normal_5fe4c0b8ca915.pdfIn PDF document text
    • https://zokelafeg.weebly.com/uploads/1/3/4/8/134889419/tunek.pdfIn PDF document text
    • https://gozopurejogutix.weebly.com/uploads/1/3/4/5/134578339/8979196.pdfIn PDF document text
    • https://soravetojovon.weebly.com/uploads/1/3/4/8/134890923/vejumefadosi-palumuwajivode-lejinofuko-tuson.pdfIn PDF document text
    • https://sakedupepig.weebly.com/uploads/1/3/4/3/134355988/7a7a4.pdfIn PDF document text
    • https://jazediwugitali.weebly.com/uploads/1/3/4/7/134730671/708dd9830c7c.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4410965/normal_60afe90fe0af7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD694 5040 bytes
SHA-256: 32257ce227fee6b67c2ec4980ac76cfb17b3eb0fd19babbbc530639f81dde8ca
font_01_sfnt_off0000e7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EC 10488 bytes
SHA-256: c7dd467493fac384e014ede9ab70814bb8993b93c5040593b0df602273495873