Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c33f62e9982431c…

MALICIOUS

PDF

79.6 KB Created: 2021-03-25 06:14:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 612cba998136dddf451f2dabc2eee139 SHA-1: 3098a45bb9b69de2a23220ef9078085f3b2b2e51 SHA-256: 6c33f62e9982431c7d1ef0aacd2039af426a9721f0d08436381484fb6eeadb14
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous external URLs, many of which point to disposable hosting and are designed to mimic legitimate downloads. The primary URL suggests a lure for a game download, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to distributing malware or facilitating phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://golowaki.ru/123?utm_term=counter-+strike+1.+6++pc+game+free PDF link annotation
    • http://mizizufiku.mywebcommunity.org/70703707183.pdfIn PDF document text
    • https://nuzunovi.weebly.com/uploads/1/3/5/3/135314570/1734834.pdfIn PDF document text
    • http://gagitevanonuti.mywebcommunity.org/82251032450.pdfIn PDF document text
    • https://xenewonunawof.weebly.com/uploads/1/3/2/7/132740417/xomonodaz.pdfIn PDF document text
    • http://wanebiwadu.iblogger.org/33422121893.pdfIn PDF document text
    • https://mifurujuxix.weebly.com/uploads/1/3/3/9/133997148/3429233.pdfIn PDF document text
    • http://zizopeja.22web.org/garefaroreveti.pdfIn PDF document text
    • http://beremoter.online/55762875402ymr2k.pdfIn PDF document text
    • http://zatoxuvisovapuf.sportsontheweb.net/wozidukevusadazotomi.pdfIn PDF document text
    • https://ketuvukelese.weebly.com/uploads/1/3/4/3/134351906/wujesugemuwimipu.pdfIn PDF document text
    • http://otshelnik.net/free_arabic_language_learning_appxi5sy.pdfIn PDF document text
    • http://sacredname.ru/wenipazibuzoxikokagarjb0s.pdfIn PDF document text
    • http://ketaton.mywebcommunity.org/gelug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9169454a-6e45-4b39-89c4-5cd9bf0a6084.filesusr.com/ugd/32fbc8_85a5472dc07a4a5cb87f6109013b055e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf657d87-ce2f-44ca-af54-b7fa6faadda9/fisategixologimotira.pdfIn PDF document text
    • http://pebumumonud.rf.gd/official_scrabble_dictionary_download.pdfIn PDF document text
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_081a6177136c4857a5e7443f08ef9729.pdf?index=trueIn PDF document text
    • http://rotufixijisadi.onlinewebshop.net/somutagutixadanokomipala.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dfc6f5f-a47e-41a2-8a63-316e7368a167/ruluga.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF872 5544 bytes
SHA-256: 0fea1df9431c686c8adce5e94acfc34a4a94cc3bc587149bc75948f72ce8cbd6
font_01_sfnt_off00010b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B50 11100 bytes
SHA-256: 13d3d432ca53eb733462400bd76e28d85fe9390b530ac942fd543ec596eead68

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