Malicious PDF — malware analysis report

Static analysis result for SHA-256 8532bc04ec349a8e…

MALICIOUS

PDF

76.1 KB Created: 2021-03-23 11:47:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 416f7395895921278b97168f7b95bb26 SHA-1: b73a18fcd68fa86c9d82cfa8c0ecd165f186d749 SHA-256: 8532bc04ec349a8e0750f0f1c4e4b4434509cdc2866cbcb390b24b06102639fd
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing infrastructure. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, hinting at its generation method and potential use as a lure for users to click on embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://dafemum.ru/123?utm_term=anthem+javelins+guide PDF link annotation
    • https://xuwupeloz.weebly.com/uploads/1/3/4/7/134734270/e9902e.pdfIn PDF document text
    • https://wimafepe.weebly.com/uploads/1/3/5/3/135326366/lurozotawap-vufolivis-merijeruk-keripavodu.pdfIn PDF document text
    • http://tofoxewesaxizuz.mywebcommunity.org/jomatujerebukuboketu.pdfIn PDF document text
    • https://sivipamekan.weebly.com/uploads/1/3/2/6/132682587/kegezodugezosozujasi.pdfIn PDF document text
    • http://jefijunanupe.sportsontheweb.net/lejiwerom.pdfIn PDF document text
    • http://boxijogirexu.medianewsonline.com/characteristics_of_cutting_tool_materials.pdfIn PDF document text
    • http://jefuvumerusew.getenjoyment.net/pneumatic_cylinder_parts.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379610/normal_6026545f5d9f7.pdfIn PDF document text
    • http://totipuzuforaz.mywebcommunity.org/beck_hopelessness_scale_questionnaire.pdfIn PDF document text
    • http://gejudoxe.mypressonline.com/abandon_ship_drill.pdfIn PDF document text
    • https://mawikimame.weebly.com/uploads/1/3/4/2/134235565/c0ad0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487641/normal_6018ccbc682c1.pdfIn PDF document text
    • http://wijetaz.mypressonline.com/54249328721.pdfIn PDF document text
    • http://vuvulusigi.scienceontheweb.net/christopher_paolini_eragon_series_in_order.pdfIn PDF document text
    • http://kujunat.medianewsonline.com/most_important_national_and_international_days.pdfIn PDF document text
    • http://vozuzutiwajuzip.getenjoyment.net/fungal_colony_morphology.pdfIn PDF document text
    • https://rekopazexejur.weebly.com/uploads/1/3/4/6/134602417/4bf04e3f92.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/gogunabones/checklist_template_for_google_docs.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/51030147437.pdfIn PDF document text
    • http://vizomonuzujo.onlinewebshop.net/kixibezosipepidu.pdfIn PDF document text
    • http://sidepojedava.myartsonline.com/expository_bible_study_outlines.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/bootstrap_templates_dashboard.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/walgreens_mini_temple_digital_thermometer_manual.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_off0000e914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE914 5268 bytes
SHA-256: f5f0cf4a80b2e3359e3445d1e8df09899f8fcf9edab2e5f2b6ab4d818f90145b
font_01_sfnt_off0000fae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE4 11892 bytes
SHA-256: 15b6978434a0a8f4ed6c0cc0bf96df3baa649753042adf9409bf0e6a45d7ce41