Malicious PDF — malware analysis report

Static analysis result for SHA-256 efcfad646ffa9282…

MALICIOUS

PDF

73.5 KB Created: 2021-04-10 05:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 393fb5837eb0fa6a09ac9e5b871783d6 SHA-1: cff676ff06462fa7b75383135772b55b73dcbad8 SHA-256: efcfad646ffa92829c4757a8f5cda1d00b9bcd5faa4a4b24b84dd4a114574bb9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/strik?utm_term=kung+fu+panda+2+streaming+service PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393220/normal_605a3b5016107.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451225/normal_60551abc146be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379032/normal_5fe40240b16ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470821/normal_606b7a6bea720.pdfIn PDF document text
    • http://latujor.22web.org/31492898256.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485162/normal_60598e4d35810.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447251/normal_605a3c5aa0234.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471513/normal_60512c4e26f7c.pdfIn PDF document text
    • https://fokepepepaxa.weebly.com/uploads/1/3/1/4/131483327/99e0127.pdfIn PDF document text
    • https://libezitotew.weebly.com/uploads/1/3/4/6/134603607/lujepizafi.pdfIn PDF document text
    • http://tesapewuj.22web.org/daihatsu_sirion_1._3_workshop_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472783/normal_6031e8e23338d.pdfIn PDF document text
    • http://afracheat5.xyz/rmlau_syllabus_2018lrf7c.pdfIn PDF document text
    • http://gusanod.22web.org/22313619225.pdfIn PDF document text
    • http://qwonder.space/9th_class_chemistry_book_free_download2h9we.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c08859a6-2587-44be-9ead-ef80aebe9f26/lopoxibodumekuluxox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ad94e5d-715f-4f03-a433-7ac3c57047a5/gabuzapinavabafisun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c0f075a-a54b-4b11-af9b-46d0a931f69b/xowewoposadi.pdfIn PDF document text
    • http://xuxekup.rf.gd/balancete_de_verificao_em_branco.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af00745e-a36f-4de3-8887-573cca00b361/diana_walstad_ecology_of_the_planted_aquarium_free_download.pdfIn PDF document text
    • http://pejonoma.epizy.com/tokadenubomoviwowosaz.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_off0000dcc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC8 5604 bytes
SHA-256: 3c672bcf00c76a422687701848ebf5187d221707dbd4ccdd2a5c67f997b27efa
font_01_sfnt_off0000efdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDC 11680 bytes
SHA-256: a5466e9de918f9878b2a3de20b11b1665338eecba1356841a774d5e5d9932709

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