Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e16822d4c373a7…

MALICIOUS

PDF

87.4 KB Created: 2021-06-14 15:36:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c75b316c29e497e3ce693bf677f24ee2 SHA-1: 46aba0542fc74a2a0981d9e75a9cbf82b2c2464b SHA-256: 18e16822d4c373a7501e7991e30246725caee720ff2d29f2f6e651aca895a378
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 URLs, with a significant number pointing to disposable hosting and acting as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pistant.ru/pbw?utm_term=new+blood+episode+1 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480161/normal_602dd5705e49e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421051/normal_6024a1c6833a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405195/normal_601a4c500ebac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495262/normal_605651deb679a.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/11e54c2f-293c-446c-9c6e-d66497a17bef/office_safety_training_videos_free_download.pdfIn PDF document text
    • http://fevosezew.pbworks.com/f/fanomademax.pdfIn PDF document text
    • http://nijosifa.pbworks.com/f/mamane_unna_kanama_mp3_song_download.pdfIn PDF document text
    • http://kigemulu.pbworks.com/f/ma_raineys_black_bottom_script.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d59d1b9-a374-4280-8750-b3e98da213b5/41242872383.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6be3e55b-71b3-444a-8f45-948ac493724f/12369983016.pdfIn PDF document text
    • http://safubudesowi.pbworks.com/w/file/fetch/144878757/52615963330.pdfIn PDF document text
    • http://dimutojopog.pbworks.com/w/file/fetch/145168698/97810291057.pdfIn PDF document text
    • http://jixerumuji.pbworks.com/f/limigexosavozodedaleme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd37a579-6dd4-4a42-99d9-639bec1e4fbe/ditixabojimerisegav.pdfIn PDF document text
    • http://tebejeloxid.pbworks.com/f/what_are_similes_in_metaphors.pdfIn PDF document text
    • http://vawijoj.pbworks.com/w/file/fetch/144625647/best_nintendo_switch_games_april_2021.pdfIn PDF document text
    • http://rutarotovez.pbworks.com/w/file/fetch/144645726/branchement_home_cinma_thomson_dpl_550_ht.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ec6c8c8-f837-4f4c-9fae-d518562f9c0e/como_crear_los_archivos_srt.pdfIn PDF document text
    • http://bilabegape.pbworks.com/f/weluvepemuwubemiravoso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f4ea502-27ee-4678-8147-d1760b8794b6/how_to_disassemble_a_taurus_pt111_pro.pdfIn PDF document text
    • http://dajodovilav.pbworks.com/w/file/fetch/144534129/cognitive_behavioral_therapy_audiobook_free.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_off00011a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3E 4900 bytes
SHA-256: 4e01f84f3daf4b4e5a2efc641414c42786d2e48985f7f96e65a04849cb01ec7a
font_01_sfnt_off00012b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B15 10988 bytes
SHA-256: ea5bdc47a41e2d0629d4678d99f6d637cac870a2c86c790fbcf551eb1ac0219f

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