Malicious PDF — malware analysis report

Static analysis result for SHA-256 e35aeb243010a9a2…

MALICIOUS

PDF

78.8 KB Created: 2021-04-02 12:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c7edd105922eef0fa98c07de9bf8d9ae SHA-1: 99781619410c02e59b074bcf30a234c8c6d77850 SHA-256: e35aeb243010a9a22bf37af62281122e6ef11398e9e3722dfcea4c145942fb5f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point to an attempt to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://ponafet.ru/strik?utm_term=2008+honda+civic+transmission+replacement+cost PDF link annotation
    • http://gubuxuk.scienceontheweb.net/rakojalafapoxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460963/normal_6025406bba8a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414701/normal_6033a9d5bda29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494165/normal_6053b40a8083c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379048/normal_6022115ff3b53.pdfIn PDF document text
    • http://kixiwogazu.sportsontheweb.net/mukeserewilusel.pdfIn PDF document text
    • http://kajuzumanaz.sportsontheweb.net/writing_and_solving_linear_equations_worksheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391599/normal_6030fd6915391.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://acda325f-ee3b-40e4-882f-fabc489a6840.filesusr.com/ugd/23b3d3_4e1ce219317e4f1ea19218fb8442b049.pdf?index=trueIn PDF document text
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_fb0d9a1539144fccbd7c3eaf5dd2988d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d22a4ea-aebb-4800-82e6-6ceeb64db089/40475286175.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/fender_mustang_1_v2_footswitch.pdfIn PDF document text
    • https://8ab1a2d5-e5b1-44c5-a28c-e09959565f0d.filesusr.com/ugd/eb712c_b4ed163771844401a53f97e631aa1450.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b56114a-cb2f-491e-a5eb-ef56b16746d8/rirafejotebazutujo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37fac528-67e3-4085-a468-bb58d66cc99d/88277402256.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dc0e7f8-f4b7-4c4c-9ac6-0c6f80170ca6/pedesuvebofe.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/mikel.pdfIn PDF document text
    • https://d397443b-80d0-4e74-967c-4ce830ee3754.filesusr.com/ugd/0a76f0_f716abf43e5b4a15ae5e5b2a2f9ab5e7.pdf?index=trueIn PDF document text
    • https://0e67983c-e844-40c9-b604-97311ec94efe.filesusr.com/ugd/6e13d9_d7ea8ff4fa874b29a9c6f9d8833fc999.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/46093267922.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ea7d509-e211-4122-8b3c-3885816f4ede/why_did_dracula_choose_lucy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2a0501a-f67a-44c4-b22d-ba4d864504af/fadiboxajivujusotu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00d39cc6-67d6-45d0-8395-3dc276df8634/83504278596.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_off0000f5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B5 5748 bytes
SHA-256: 16fa4d7ec3f95686bce77d48bd7ed7e91d8bfd42dbe49785d29ae5173211e7ef
font_01_sfnt_off0001091d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091D 10664 bytes
SHA-256: 5c540425b4787ebd6fc97d09d89504cdbf136d7b73fa4bd4f7ca5958ca448696