Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e11c708664e8359…

MALICIOUS

PDF

76.4 KB Created: 2021-04-02 07:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 7b934f1efac83783512869d903d0dbb8 SHA-1: b0ec86a63575d3d078b4fee19eddab0fbc3e529e SHA-256: 9e11c708664e8359b2c9351b24a358802cd31bfc9502cc1d6aba282ef744e382
186 Risk Score

Malware Insights

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

This PDF document is classified as malicious, exhibiting characteristics of a link farm designed to redirect users to various external sites. The heuristics indicate a high volume of external links, many hosted on disposable domains, suggesting a phishing or scam attempt. The embedded URLs, such as 'https://vilenefex.ru/123?utm_term=gameboy+advance+emulator++for+pc', are likely part of this redirection scheme.

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
  • 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://vilenefex.ru/123?utm_term=gameboy+advance+emulator++for+pc PDF link annotation
    • https://cdn.sqhk.co/satofurijob/idigggi/virtual_mom_police_family_simulator_apk.pdfIn PDF document text
    • https://fewifaki.weebly.com/uploads/1/3/4/5/134578400/6371243.pdfIn PDF document text
    • https://jowatoziji.weebly.com/uploads/1/3/4/8/134893097/e75a7c23aaa.pdfIn PDF document text
    • https://wolapegod.weebly.com/uploads/1/3/0/7/130776073/1374935.pdfIn PDF document text
    • https://gudivolopuna.weebly.com/uploads/1/3/5/3/135346868/e31e35286c0c8.pdfIn PDF document text
    • https://vemusosafuz.weebly.com/uploads/1/3/1/3/131398108/vafezuze.pdfIn PDF document text
    • https://palepolute.weebly.com/uploads/1/3/5/9/135963306/5052212.pdfIn PDF document text
    • https://popetufuwude.weebly.com/uploads/1/3/1/4/131483025/9ed4d0b1abe.pdfIn PDF document text
    • https://vunafenivanisip.weebly.com/uploads/1/3/5/3/135303543/futejamovelasuzunu.pdfIn PDF document text
    • https://zuzotupewumu.weebly.com/uploads/1/3/4/6/134691050/rejakavafu.pdfIn PDF document text
    • https://cdn.sqhk.co/begesiki/hwjdieA/26412287271.pdfIn PDF document text
    • https://vewudati.weebly.com/uploads/1/3/0/8/130873955/rigibuzeri.pdfIn PDF document text
    • https://zojegidaluvimov.weebly.com/uploads/1/3/4/1/134109086/6641938.pdfIn PDF document text
    • https://vemanilulo.weebly.com/uploads/1/3/4/3/134378365/2122559.pdfIn PDF document text
    • https://fodivavix.weebly.com/uploads/1/3/1/4/131483454/topupeguzitape_gajimedabo_delajonuromox_tazufuzowige.pdfIn PDF document text
    • https://cdn.sqhk.co/sunaxidida/Jiem3Co/8230109039.pdfIn PDF document text
    • http://valaporinepisu.22web.org/pimujigutixasi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bejovivijif.epizy.com/descriptive_writing_topics_for_grade_7.pdfIn PDF document text
    • http://pimoked.rf.gd/gilajetaju.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_off0000edcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCC 5456 bytes
SHA-256: 11829455bd0b2194ecb584f8fe1b6ab42a7aeb56d3da8372ffccb3cb3593898c
font_01_sfnt_off00010052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10052 10660 bytes
SHA-256: 779de3b9c4630551410aab8aafb622205061a320e2e7797f818655a5f0099066