Malicious PDF — malware analysis report

Static analysis result for SHA-256 687030dee970c927…

MALICIOUS

PDF

130.4 KB Created: 2021-06-10 03:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2b379d70312bf2e6fdb72599b2ff239b SHA-1: 034011f8228f19552ba3006b18b0c92076883a7a SHA-256: 687030dee970c927a2310eb36f1ceee59eb214ee6ce6a09954f793eaa4cef29f
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a medium-severity rule indicating it is a link farm on disposable hosting. The ML classifier and ClamAV also identified it as malicious. The embedded URLs and the nature of the heuristics suggest a phishing or scam attempt, likely distributing further malicious content or leading to fraudulent sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crysiq.ru/pbw?utm_term=download+ebook+novel+dewasa+pdf+gratis PDF link annotation
    • https://nulokedebuzeb.weebly.com/uploads/1/3/4/3/134310318/bepumabexi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374203/normal_5fe9fed268d35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463791/normal_60bd275dddaaf.pdfIn PDF document text
    • https://gisidamuxifa.weebly.com/uploads/1/3/0/7/130775495/zemujiwi.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/93ff3a4928814.pdfIn PDF document text
    • https://fupigipefixoxom.weebly.com/uploads/1/3/1/3/131379213/faxiwosuwim.pdfIn PDF document text
    • https://lowixuwegula.weebly.com/uploads/1/3/0/7/130775587/44d4b1.pdfIn PDF document text
    • https://gunowiwusofemu.weebly.com/uploads/1/3/4/7/134705227/gowekutixofub-kitefaw.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/955d0ccc-22e9-4584-86c3-aa240fa10dfc/shark_ion_robot_not_running_on_schedule.pdfIn PDF document text
    • http://fuxijovipa.pbworks.com/w/file/fetch/144613374/xanejekelus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba0f4cf0-4152-442c-be27-f62bda4b30aa/vowobovilasasojuwaxovor.pdfIn PDF document text
    • http://subazim.pbworks.com/w/file/fetch/144716484/talking_tom_2_hack_mod_apk_unlimited_everything.pdfIn PDF document text
    • http://tusawijer.pbworks.com/w/file/fetch/144650175/77349116129.pdfIn PDF document text
    • http://xalanupuzewo.pbworks.com/w/file/fetch/144423477/varuzutonasediwunufakaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71430cc4-ad03-45f7-b3c7-0b72bb67c9e1/what_do_tigers_symbolize_in_japan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf2ed1b4-a5ce-400f-83c1-75a510a1ac83/sodarinurabawuzewo.pdfIn PDF document text
    • http://tulusozofel.pbworks.com/w/file/fetch/144996144/minecraft_mcpe_bedwars_server.pdfIn PDF document text
    • http://wusajigi.pbworks.com/f/linguagem_corporal_cristina_cairo_livro.pdfIn PDF document text
    • http://gudikijuruf.pbworks.com/f/karunakosise.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_off0001b155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B155 3684 bytes
SHA-256: c5bf56ae367f8e5f92f795b2e96e31951dd69fc55004038109e56026a873f7ae
font_01_sfnt_off0001bd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD54 5564 bytes
SHA-256: e2b3271a9fcaacbf58a8fba9957289ae1f8b166a256fd2623eb12c0d065d51e0
font_02_sfnt_off0001d06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D06C 13208 bytes
SHA-256: a4eb700503b2f35427331da952134f888e384b8f96ade7498d5a0841b0b686e8