Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4a91882638f4265…

MALICIOUS

PDF

73.7 KB Created: 2021-04-05 12:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7857d2e9fbace63bced906f49f6768e4 SHA-1: b513f6a85038813f589be92e024f28ccc86c5778 SHA-256: e4a91882638f42657c8a3a86782f90ac1ed6e01eb49f49f9237597d537fa44c2
244 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to redirector infrastructure or disposable hosting, suggesting a link farm or phishing campaign. The document body is heavily obfuscated and appears to be a lure related to a 'Husqvarna 455 rancher service kit'. The presence of numerous external links and the ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://dafemum.ru/strik?utm_term=husqvarna+455+rancher+service+kit In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366952/normal_6050200d36ae3.pdfIn PDF document text
    • https://teligodinawam.weebly.com/uploads/1/3/4/4/134457670/a93d887f83d37b6.pdfIn PDF document text
    • https://bopugokux.weebly.com/uploads/1/3/4/9/134901566/0ace46c3d3.pdfIn PDF document text
    • https://zolagefotatol.weebly.com/uploads/1/3/4/7/134709454/7f9c336052.pdfIn PDF document text
    • http://libralab.digital/xefikeptj7we.pdfIn PDF document text
    • https://lonitavow.weebly.com/uploads/1/3/4/3/134355974/dalom.pdfIn PDF document text
    • https://fopokefizig.weebly.com/uploads/1/3/4/5/134525302/8208710.pdfIn PDF document text
    • https://dipediras.weebly.com/uploads/1/3/0/7/130739778/94bffd3c.pdfIn PDF document text
    • https://ramokazadi.weebly.com/uploads/1/3/4/4/134470245/takibodevuz-zedukutepufen-xinimasepo-jobefagezi.pdfIn PDF document text
    • http://gutprod.xyz/invaders_from_mars_1953_ok._ruwnbyy.pdfIn PDF document text
    • https://nimawotamuxagop.weebly.com/uploads/1/3/1/6/131606149/xaxajofodawaxarup.pdfIn PDF document text
    • https://niwezeruzebunol.weebly.com/uploads/1/3/5/3/135387699/3584074.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422134/normal_602f60933fda8.pdfIn PDF document text
    • https://retizobokeli.weebly.com/uploads/1/3/1/0/131070240/kutafumabobi_vapera_tonuk_xotudonejifom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386824/normal_5ff506e41aa17.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/setigafat/sukavixirakuv.pdfIn PDF document text
    • https://s3.amazonaws.com/dofufiri/english_lessons_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dde00b53-7358-4ea8-a520-d8c35608ed8e/40704679107.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94e07f21-f341-41a4-8f95-fca31dd0d22a/zipujunibixepe.pdfIn PDF document text
    • https://s3.amazonaws.com/wizakokowe/77793804084.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdc38195-4ab9-4021-beae-83469661ec12/72885561850.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/microsoft_net_framework_4._6_filehippo.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_off0000def9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF9 5280 bytes
SHA-256: 3114221eab4fa4ad7db54f45b478796825dc0a406132d604301d10e7e0673953
font_01_sfnt_off0000f0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FC 12052 bytes
SHA-256: 44f10b7b8199c495008b62d4477c09603784ab2fcb6b3013d806444b2105f04b