Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e96bb590ad001b…

MALICIOUS

PDF

104.3 KB Created: 2021-03-01 20:56:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: aa679f4d3e096ac890766410f1638c00 SHA-1: dabd11c888b718cbcd88d55a54bf2105b6f8c8b9 SHA-256: 91e96bb590ad001be781c110c20b9ecddb2ea916584e2d2723fe7eb333c9219d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://dugedepap.ru/aws?utm_term=which+dyson+is+the+best+for+animal+hair PDF link annotation
    • https://womonejod.weebly.com/uploads/1/3/2/6/132681039/4496424.pdfIn PDF document text
    • http://fosipuzo.mypressonline.com/sokibupunoloxijez.pdfIn PDF document text
    • https://cdn.sqhk.co/dugixikisim/DzBieNR/naxeex_superhero_apk.pdfIn PDF document text
    • https://tuvexora.weebly.com/uploads/1/3/4/6/134618292/lurotiganup.pdfIn PDF document text
    • https://cdn.sqhk.co/kasavakujosi/YpJhg38/wopade.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387565/normal_6009012abe1e8.pdfIn PDF document text
    • http://zibepifutidi.sportsontheweb.net/food_safety_salary_canada.pdfIn PDF document text
    • https://nimaxosonoj.weebly.com/uploads/1/3/4/8/134897368/koduz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389599/normal_60135981274d7.pdfIn PDF document text
    • https://cdn.sqhk.co/rivogigaweb/fUg2hih/vazuxozojelilazijajola.pdfIn PDF document text
    • https://cdn.sqhk.co/nesorosuxim/idRohfS/regukoloxapiso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410206/normal_602439f0e080b.pdfIn PDF document text
    • https://bimuxafidiw.weebly.com/uploads/1/3/4/7/134701061/redixakil-kekoxevuz-varovazafedul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406213/normal_6009da1328767.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/legobegutulo/mozilla_web_browser_for_pc_free.pdfIn PDF document text
    • http://sabixukavizom.myartsonline.com/what_is_the_difference_between_viral_and_bacterial_sore_throat.pdfIn PDF document text
    • http://wokikeka.epizy.com/jotikuwup.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/72302030801.pdfIn PDF document text
    • http://vubelifijam.atwebpages.com/ao_del_modelo_atomico_de_dirac_jordan.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_off00015963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15963 5516 bytes
SHA-256: 5f300c50a9227f896292017990e60c0f2cf2e8bfb117e864d5fc2d5781971cc6
font_01_sfnt_off00016c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C0B 11592 bytes
SHA-256: 51e046d2a3088e1c6cfeca5b4c173cac993ffb207a9c76159e91156a4b0d9862

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