Malicious PDF — malware analysis report

Static analysis result for SHA-256 a685f9af63c0ebe9…

MALICIOUS

PDF

84.2 KB Created: 2021-04-28 16:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f28a71c94908babbb881c1dcacc518c8 SHA-1: da310ce5f9f1912c88ac4ca1d5993c2a41d76dd9 SHA-256: a685f9af63c0ebe9193990c4de52156280bd56f707d29be2d5b9cb6389c7d518
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm hosted on disposable domains, designed to redirect users to external URLs. The embedded URL 'https://midufefew.ru/strik?utm_term=dean+koontz+movies+streaming' suggests a phishing or scam lure related to movie streaming. While no scripts were explicitly extracted, the PDF structure and link farm nature strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://midufefew.ru/strik?utm_term=dean+koontz+movies+streaming PDF link annotation
    • https://cdn.sqhk.co/borefigux/eogyijP/48877670396.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411937/normal_5fccd7f78c0ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458125/normal_606b490d11cd7.pdfIn PDF document text
    • http://ritegifufefut.scienceontheweb.net/all_about_me_in_spanish.pdfIn PDF document text
    • https://zapotaputilaka.weebly.com/uploads/1/3/2/6/132683001/bisuzubafa.pdfIn PDF document text
    • https://cdn.sqhk.co/lamiwifa/DihXjdc/tippy_tippy_tap_book.pdfIn PDF document text
    • https://vuxamirajuka.weebly.com/uploads/1/3/6/0/136082549/gazidoxu.pdfIn PDF document text
    • https://pamigewome.weebly.com/uploads/1/3/4/6/134631685/1021c3.pdfIn PDF document text
    • https://cdn.sqhk.co/vemegunir/fidQ3ox/sunshine_house_resale_store_sturgeon_bay_wi.pdfIn PDF document text
    • https://muragifenujokuf.weebly.com/uploads/1/3/1/1/131164382/silakusexir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450723/normal_5fd80e6e338d9.pdfIn PDF document text
    • http://kimiter.medianewsonline.com/albany_state_university_application.pdfIn PDF document text
    • http://bukobaxaz.getenjoyment.net/bivorunon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489237/normal_5fd33786634f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479435/normal_5fe4ae156a926.pdfIn PDF document text
    • https://zepekofudi.weebly.com/uploads/1/3/1/4/131407423/lovitezufazinukamo.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/xulepiwa/21815499621.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15a641fb-9d7c-45c9-a0da-33478288b050/43776815933.pdfIn PDF document text
    • http://mikijanux.atwebpages.com/83682202545.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c15ac40b-eb57-4e5a-8b63-6ae53bb5d666/how_to_share_a_facebook_memory.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/55497710769.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/94232788586.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69ef1181-7432-46cd-a926-9812768f1a49/8150106958.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad817f01-c11c-484b-a729-26f01b307cde/44223619019.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_off0001095d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095D 5148 bytes
SHA-256: 1d1c879ba113d57b9b9853e67e4366e5274c5a79365f1b6edc60cd2cba32e1fe
font_01_sfnt_off00011ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE5 11440 bytes
SHA-256: bb474dbd2ae2492746c42792f21bea983d129fd3cb0feeaeab6f24445e486cea