Malicious PDF — malware analysis report

Static analysis result for SHA-256 631d235a5f8a35cf…

MALICIOUS

PDF

94.9 KB Created: 2021-04-06 00:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: eb851e7a723aeef47614eb994b0df696 SHA-1: 7bcc744237f8b7fbadb5a80699d87f7b07ae401f SHA-256: 631d235a5f8a35cf745483d923cca11d579ce60b44a2c19c69647e6ccaba931a
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It functions as a link farm, containing numerous external URLs, with a primary suspicious URL pointing to 'soxebez.ru'. The presence of a link farm on disposable hosting suggests an attempt to distribute malicious content or conduct phishing operations. While no scripts were explicitly extracted, the nature of the link farm implies an intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://soxebez.ru/award?keyword=chimie+g%25C3%25A9n%25C3%25A9rale+atomistique+pdf PDF link annotation
    • https://cdn.sqhk.co/divoxisig/ahba0jf/top_40_radio_charts.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/numbers_in_words_1_to_1000.pdfIn PDF document text
    • http://mutujejeturuduf.medianewsonline.com/settlers_of_catan_cards.pdfIn PDF document text
    • http://mamubisuk.mypressonline.com/dreams_from_my_father_novel.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/troy-bilt_27_ton_log_splitter_parts_diagram.pdfIn PDF document text
    • https://cdn.sqhk.co/figegixo/rgSRjiR/pudinezitili.pdfIn PDF document text
    • https://cdn.sqhk.co/bemaxopig/XqvgiLr/pba_tour_bowling.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/a4183914-7441-4d9f-8142-3964e1b012a7/20813781939.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f887a587-43a6-4a8b-bf2e-9bc7ad2cedca/3100016451.pdfIn PDF document text
    • https://f238abdf-92e3-4651-90df-65b6e8a648d9.filesusr.com/ugd/99965f_5a9267b8e2d240079362f17c15d8ff12.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d970a51-d716-44af-8650-08b24f0de6f8/usps_online_customs_form_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15c6294b-ee5c-410e-9d69-8a297f5b557f/8472959892.pdfIn PDF document text
    • https://37e79482-e567-4eff-b449-6ea9b90d4679.filesusr.com/ugd/cff0cd_b26e05e02f6941b58a06ba5f65552520.pdf?index=trueIn PDF document text
    • https://443275ec-395d-4f86-84c9-2ed7a250e117.filesusr.com/ugd/7d471d_3add0a45d20844499d7368fb982377e5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0be7c040-527d-4557-b34d-66a849437936/mp3_to_midi_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c5d98d1-4f1b-4b71-a712-29db2f42e170/lomeluxababesa.pdfIn PDF document text
    • https://591e60e9-54e8-4b06-a9a7-f2e0522969d0.filesusr.com/ugd/1fd4b7_7823ec19c6bc43d3995e6c8abadbd3d6.pdf?index=trueIn PDF document text
    • http://lejiletuvasipib.onlinewebshop.net/how_much_do_customer_service_managers_at_walmart_make.pdfIn PDF document text
    • https://a2214900-82f6-4ed5-a432-d5ffd14110fa.filesusr.com/ugd/306b6b_6f834b84bd9343ea8f3375818bd02291.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a7e9040-2cdc-402f-9c2b-12f740f6e117/62420030078.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fe0359c-08eb-4350-9286-3d7a3e648097/lutezorun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f4b045e-6f9e-48e2-93a3-14d2c75b7f72/23905196637.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b21ddc6-48df-4a4b-aca2-b76fc6976450/relative_pronouns_worksheet_for_6th_grade.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA5 5628 bytes
SHA-256: 08015ff7b1e0d753ce20393d7b22eb38f951b019acb17552fa53b060d283cd7a
font_01_sfnt_off00012e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E51 15140 bytes
SHA-256: 62f257c53414159d1dec9796143092b4e594106c400e89b5cb9960d3eaf6c03f
font_02_sfnt_off00015dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DFB 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378