Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af4fee62f9e302a…

MALICIOUS

PDF

86.7 KB Created: 2021-06-10 09:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 6d8c95fe7e3673cc5a97f0cdec3f224a SHA-1: de9c924fd68dbaa7b8594f9d8c97c5d7833febb4 SHA-256: 4af4fee62f9e302a038b9c8c288053550eaf5c20f35647a4934e4defa3beda9f
126 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 embedded URLs, with a primary focus on directing users to 'oniceh.ru'. Heuristics indicate this PDF is part of a link farm designed to redirect users, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged this PDF as malicious, suggesting a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://oniceh.ru/pbw?utm_term=trigonometry+finding+sides+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382773/normal_604e7504b2100.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408587/normal_601af97553323.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wufamazajo.pbworks.com/f/27776981247.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03876f60-0104-44f9-ac89-5d2ca49f214c/pimeketivopidojorekerug.pdfIn PDF document text
    • http://fajopab.pbworks.com/f/online_registration_in_kendriya_vidyalaya.pdfIn PDF document text
    • http://nudifimixonu.pbworks.com/w/file/fetch/144912126/nfs_most_wanted_2005_download_for_android.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/w/file/fetch/144417282/how_to_find_moodle_answers_with_inspect_element.pdfIn PDF document text
    • http://tuvovazuvezo.pbworks.com/w/file/fetch/144731655/jujixajariliziruxojuma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b5d2fa6-63b3-4f39-82f9-c8c7c3b98518/11036550164.pdfIn PDF document text
    • http://tazijebep.pbworks.com/f/77806212844.pdfIn PDF document text
    • http://tagexoba.pbworks.com/w/file/fetch/144942906/calculating_volume_of_a_rectangular_prism_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33cffcc1-1a8f-48c5-90e8-f740b40d8c30/ps_vita_slim_brand_new.pdfIn PDF document text
    • http://doxawadar.pbworks.com/f/how_to_convert_docx_to_doc_on_android.pdfIn PDF document text
    • http://zelovoguvunu.pbworks.com/f/how_many_days_uscis_take_to_send_approval_notice.pdfIn PDF document text
    • http://deduxofevit.pbworks.com/w/file/fetch/144680913/variable_dependiente_e_independiente_psicologia.pdfIn PDF document text
    • http://lururefisu.pbworks.com/f/61977848835.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72e0ea58-0616-4930-b552-658b621d74ff/full_quran_sharif_mp3_free_download_with_urdu_translation.pdfIn PDF document text
    • http://fibonilavi.pbworks.com/w/file/fetch/144895182/7671176375.pdfIn PDF document text
    • http://jeselivid.pbworks.com/w/file/fetch/144489456/how_do_you_reset_a_frigidaire_portable_ice_maker.pdfIn PDF document text
    • http://pugaxigodaka.pbworks.com/w/file/fetch/144616311/8792840615.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db32767b-81ad-4e98-a330-363292c10258/zebul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b00eeab4-ebf3-4e0d-9f09-a41be3ae1cf7/how_to_solve_2x2_rubiks_cube_easy.pdfIn PDF document text
    • http://murusefikuk.pbworks.com/w/file/fetch/145007793/gujakenozefigemupev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdaaa280-cca5-4512-8768-8ccdce1e72a5/125_gramos_de_harina_en_ml.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B8 3040 bytes
SHA-256: 20d8b56c16c3609fb6e24143b6a369ec569aa48f7b76bf72401f3f946a491cb2
font_01_sfnt_off0000fda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA4 5288 bytes
SHA-256: 4a9a7c7a3e8c1ce8d0973437f15d1ba04ed013ec14595f14281184b7291b236b
font_02_sfnt_off00010f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F98 11400 bytes
SHA-256: 85b6300b3b885a56acf4c35f7e61bc16310984b5c46548c3e662a6a4ef89d9e9
font_03_sfnt_off000136e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E3 16188 bytes
SHA-256: 813c911aeb7fa7e1eda338509f2cf2ab1941e5f8fa01a3baf53996bf625be10c

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