Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0d655a033117e9f…

MALICIOUS

PDF

88.0 KB Created: 2021-03-18 01:45:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 91266eba7aa382f406d4980ff3d3532d SHA-1: 7076daa618a998055d242726c08f3b339adb64e1 SHA-256: e0d655a033117e9f8d84cb980ca4e0b44323009b366e1cd00aae8181428dbaea
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with one suspicious URL pointing to dafemum.ru. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO manipulation. No scripts were extracted, but the embedded URLs and link farm structure suggest a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dafemum.ru/strik?utm_term=the+republic+of+sarah+cw+trailer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447915/normal_6014665d6b3c3.pdfIn PDF document text
    • https://rowopubogapog.weebly.com/uploads/1/3/4/2/134234702/8037313.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457839/normal_6014d5030b360.pdfIn PDF document text
    • https://woteginawewe.weebly.com/uploads/1/3/1/3/131379999/vatavavopo.pdfIn PDF document text
    • http://wumomotetidofe.getenjoyment.net/ludaledeb.pdfIn PDF document text
    • http://vijevejumozugim.sportsontheweb.net/maschine_mikro_mk2_manual_espaol.pdfIn PDF document text
    • https://revugegan.weebly.com/uploads/1/3/4/6/134682990/4125500.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401983/normal_5fedf90e4dfe5.pdfIn PDF document text
    • https://fobaripiso.weebly.com/uploads/1/3/4/4/134443650/4aad35a7a7058.pdfIn PDF document text
    • https://gilotimo.weebly.com/uploads/1/3/4/8/134899899/9300661.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476446/normal_5fceef953768b.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/c4d63880-017d-4c76-8c83-d81cd7e04e30/ford_ranger_parts_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2c2843c-d163-4227-9c42-bb9410aa32de/61915712140.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/fodametawowopul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f1b567a-e2c0-4d1c-9467-e606f0f7ce8d/mexibawojuful.pdfIn PDF document text
    • http://dopovis.myartsonline.com/percy_jackson_sea_of_monsters_book_chapter_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66601e20-e5b9-46b3-9d09-b938d3919ef0/midland_t20_x-talker_16_mile_walkie_talkie_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/24513849126.pdfIn PDF document text
    • http://zenakezogutomu.onlinewebshop.net/50571705162.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4b784f1-3b49-488d-ac38-cbaedf2dac57/my_wireless_keyboard_and_mouse_stopped_working_dell.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_off00011af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF7 5284 bytes
SHA-256: 7c0c234fef9aa56136390dd60ed0badd8e04e580cfa6a089e73b6b598e0ec7a4
font_01_sfnt_off00012cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFA 11248 bytes
SHA-256: 5feac4036994955d788b1ba461b20e5edd11ff56d5b9693a83070f04a456ede6

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