Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c5f9252b4bbfad…

MALICIOUS

PDF

73.4 KB Created: 2021-06-01 09:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 9d59dfa55ba9b329c26ba360cb2a8bc8 SHA-1: ae67a3320c17705fa26b16be639e99da2450d060 SHA-256: 42c5f9252b4bbfad2eb30a596e1378d506d785139462c204914c42bf66b5e666
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links pointing to various PDF files hosted on disposable domains, indicating a link farm or SEO manipulation scheme. The presence of embedded URLs and the overall structure suggest it's designed to redirect users to potentially harmful content or facilitate further distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://irlanc.ru/pbw?utm_term=type+in+pdf+file+online+free PDF link annotation
    • https://sipopomek.weebly.com/uploads/1/3/4/6/134632846/gofadesifewa-zeximedopu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378161/normal_604ce17e1b3cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383687/normal_5fcb5aed1b47c.pdfIn PDF document text
    • https://navijaxilof.weebly.com/uploads/1/3/2/6/132696044/8680297.pdfIn PDF document text
    • https://moxujudafetofa.weebly.com/uploads/1/3/2/7/132712376/1810349.pdfIn PDF document text
    • https://lotetirupaxep.weebly.com/uploads/1/3/4/0/134013035/fuwamivesowadodukoxa.pdfIn PDF document text
    • https://kirikunekev.weebly.com/uploads/1/3/4/7/134737840/92f98.pdfIn PDF document text
    • https://refapezi.weebly.com/uploads/1/3/4/9/134904673/5ffba0ec50fe231.pdfIn PDF document text
    • https://kezexawu.weebly.com/uploads/1/3/0/8/130814062/vubirakopeguvazus.pdfIn PDF document text
    • https://mabexerezigija.weebly.com/uploads/1/3/5/3/135324341/pineku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383912/normal_602a5a90ebef3.pdfIn PDF document text
    • https://pufigisefabu.weebly.com/uploads/1/3/4/3/134351441/depanefudunajubedisu.pdfIn PDF document text
    • https://sulabejo.weebly.com/uploads/1/3/4/6/134689147/5892280.pdfIn PDF document text
    • https://bojirutewum.weebly.com/uploads/1/3/4/6/134622564/e2023.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459935/normal_60315fcfc0fe8.pdfIn PDF document text
    • https://kobetuditi.weebly.com/uploads/1/3/4/4/134446504/bovemasixop.pdfIn PDF document text
    • https://fidurelofomus.weebly.com/uploads/1/3/0/7/130740547/xijularisarodinide.pdfIn PDF document text
    • https://vinazawodix.weebly.com/uploads/1/3/4/3/134352366/ludelu.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/90b432c4-839c-445f-abd5-30807527f1de/simplifying_complex_numbers_independent_practice_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5145aab-5833-48cb-89c7-fb6b9c03199f/74893535088.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91b1f655-5e53-4f42-ae21-93c42ad23f1c/21639388235.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_off0000e35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35E 4700 bytes
SHA-256: e1d0bb54b6889281d0d5633e38915d9dee7314109c110b9cb8f89148148f1b3a
font_01_sfnt_off0000f375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF375 10864 bytes
SHA-256: 7623e893c461a4e9327b6e8eb7075ed77473d6ea6bc914dffd20fa107de51460