Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f8d371e633cc3c3…

MALICIOUS

PDF

110.4 KB Created: 2021-02-08 01:55:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 747e31406cc08cb648c4d287b292a73f SHA-1: 9d72cd5cf0087aa3be60cdff23a09652bced69da SHA-256: 6f8d371e633cc3c3b49174a3662097fc9931956f1603eb37ab800c19db30a517
244 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on disposable or suspicious domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs, such as 'https://yafferge.ru/wb?keyword=black%20desert%20remastered%20mystic%20guide', are critical indicators of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wb?keyword=black%20desert%20remastered%20mystic%20guide In PDF document text
    • https://pudorexejuvaw.weebly.com/uploads/1/3/1/4/131455832/167b747685.pdfIn PDF document text
    • https://sobexezawatu.weebly.com/uploads/1/3/4/9/134903145/dilewalutev.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/gu9hg53/rerituluwetixafumonilesu.pdfIn PDF document text
    • http://fitukogamoj.iblogger.org/corenexa_user_guide.pdfIn PDF document text
    • https://kawifapexevudo.weebly.com/uploads/1/3/4/7/134711131/7395278.pdfIn PDF document text
    • https://cdn.sqhk.co/tukawezezo/v2xibjg/arma_mobile_ops_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/sovanoniwuva/pFaxibL/72822223390.pdfIn PDF document text
    • https://zisojuvamifofe.weebly.com/uploads/1/3/1/3/131383842/9137247.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379742/normal_600e6829df177.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367313/normal_60078e5423571.pdfIn PDF document text
    • https://cdn.sqhk.co/rasepotobami/hiimijc/12178106006.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370746/normal_60011df6c4df6.pdfIn PDF document text
    • https://ranibifuvif.weebly.com/uploads/1/3/1/3/131381542/c8319dd8986.pdfIn PDF document text
    • https://fuviwezajoz.weebly.com/uploads/1/3/1/3/131379384/gevukepu_zawikuvavo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391599/normal_5fd1c2d79b846.pdfIn PDF document text
    • https://gerugufudob.weebly.com/uploads/1/3/4/8/134869234/3992580.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duguteterexu.epizy.com/khmer_lunar_calendar_2019.pdfIn PDF document text
    • http://sesisat.epizy.com/kunuxurajudukomele.pdfIn PDF document text
    • http://tarobajasupimi.epizy.com/nogazijuf.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_off00017347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17347 5476 bytes
SHA-256: 610c14313fe8a504a00abfe27ce4ee69bf438bb362fb0f73a0c09430089e7ef9
font_01_sfnt_off000185de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185DE 11660 bytes
SHA-256: aad89d451d5ca5cb1656993085bec11de3356e90a24e2dc32bb0f6d72303ac38

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