Malicious PDF — malware analysis report

Static analysis result for SHA-256 2693a48eb0b14bc5…

MALICIOUS

PDF

78.6 KB Created: 2021-06-07 15:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4a74b8bddcee63d49cc9da767c1b96d2 SHA-1: 71ec1db7ba80a4fda4f244d62d59f34726dedb76 SHA-256: 2693a48eb0b14bc59ebc80d8f949e4dd64816f3277579418b6a861326b9b831c
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://huntic.ru/pbw?utm_term=jlg+t350+boom+lift+operators+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4504568/normal_60619b06ba504.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381543/normal_60bdcbb231405.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404310/normal_606064377a2d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456663/normal_5ff907a090cd2.pdfIn PDF document text
    • https://litudawugo.weebly.com/uploads/1/3/3/9/133997631/5544032.pdfIn PDF document text
    • https://jololese.weebly.com/uploads/1/3/4/5/134599323/2949383.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495264/normal_602f1a1a11850.pdfIn PDF document text
    • https://tavazoxivozu.weebly.com/uploads/1/3/4/9/134901219/2468004.pdfIn PDF document text
    • https://buzolemego.weebly.com/uploads/1/3/5/3/135393469/nobutox_fojak_zizakefus.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/ca38af38-173e-4409-bd19-3a7e13499d08/21537209171.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/321dcbbb-860f-42b6-a99e-8b2c87d30065/essentials_of_english_grammar_and_composition_answer_key_class_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c42bac8-2fb0-4992-aa22-9700489b17ee/teaching_by_principles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c14e020d-dfda-40c5-85a9-a64f7647f91a/find_google_voice_number_by_email_address.pdfIn PDF document text
    • http://wotasaful.pbworks.com/w/file/fetch/144456900/pufexekinawogutixaruxipi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1b444af-db10-4b33-8ae6-f78972bbc8e4/fokavamabinoxonibekefule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fe2cfed-94d9-4cfd-8242-6a2b067293ba/burasarokazutusogojale.pdfIn PDF document text
    • http://wixumip.pbworks.com/f/36834567517.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/619da9c2-d75d-4c08-a6ce-beadaec2a178/bukevokekogiwisivurexas.pdfIn PDF document text
    • http://jujirafamena.pbworks.com/f/density_of_aluminum_foil_lab.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD89 5780 bytes
SHA-256: 06b0bf68fdb373c0f6c50d9f70ce787baf076ad3f6da3529ec57b0870b8feeae
font_01_sfnt_off0000f126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF126 10748 bytes
SHA-256: f87aead6b30dadd89ab4f2e098fa52c214964f1d0dec8e74733e98e09023bd0a
font_02_sfnt_off0001161a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161A 16140 bytes
SHA-256: 2732c78df68b4531e26da51a256f0f9ab881cb8a96d1886ade34872d88eeece3