Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dce7280bbd7ed5e…

MALICIOUS

PDF

83.3 KB Created: 2021-03-06 12:01:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 47ea82a81b94025efc4dfa257650551b SHA-1: e3d4ffd93a7c54624d1ddd03f63c7497c5f07a4b SHA-256: 9dce7280bbd7ed5ee14ade1e15d5154e0cae41646718ff8c1d3cdc07a366db6f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs points to an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=best+books+to+read+on+product+management PDF link annotation
    • http://woxijakuzadajew.getenjoyment.net/42458675425.pdfIn PDF document text
    • https://cdn.sqhk.co/gidetixi/bdDgfgj/1886796716.pdfIn PDF document text
    • https://viferoxabuged.weebly.com/uploads/1/3/4/2/134235394/riguxofalijej_gawabajidol_petulamolikebe_jovaj.pdfIn PDF document text
    • https://cdn.sqhk.co/dutaxato/ijeXuia/28181263823.pdfIn PDF document text
    • https://cdn.sqhk.co/manaruparil/lzjbTge/39532901410.pdfIn PDF document text
    • https://cdn.sqhk.co/lasanamemego/QjdtRhe/what_the_hen_1on1_summoner_game_wiki.pdfIn PDF document text
    • http://forajadafogaxuv.medianewsonline.com/laruxonejutuzobawe.pdfIn PDF document text
    • https://ladunibik.weebly.com/uploads/1/3/4/0/134096621/wabikajoluxefad.pdfIn PDF document text
    • http://zaxevef.getenjoyment.net/briggs_and_stratton_550ex_oil.pdfIn PDF document text
    • https://cdn.sqhk.co/pabukerofo/iJgchj5/janawexomajubejalosuketa.pdfIn PDF document text
    • https://fegafedanopi.weebly.com/uploads/1/3/4/3/134311678/bowumetapuz.pdfIn PDF document text
    • http://gekifek.scienceontheweb.net/the_reluctant_fundamentalist_chapter_1_quotes.pdfIn PDF document text
    • http://vazewuxu.mywebcommunity.org/how_to_charge_my_ps_vita_without_the_charger.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
    • http://bifovigavij.myartsonline.com/gamopaguvezoze.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/xotogubosomipobagadapap.pdfIn PDF document text
    • http://rigidafavubo.myartsonline.com/wabojubutuvufa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff5a464f-8699-46ad-acb5-1fef7729f018/do_the_marvel_actors_get_along.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/medesujuw.pdfIn PDF document text
    • http://rulamiji.onlinewebshop.net/identify_the_main_idea_and_supporting_details_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ceed6b86-bdf4-44ab-8dff-bd9e2c912ce8/tibusisud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e564d3b6-d467-4b7b-b5e5-d4133f78ea90/you_are_my_world_quotes_and_sayings.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_off0000f910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF910 5448 bytes
SHA-256: 2e70339f04f222f2fe879d708fdabe795fab8aa5bc47752061c3bf318ac3c1f9
font_01_sfnt_off00010b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B78 11092 bytes
SHA-256: 24d075ebf8f3d1aec6dd7c7dc63f6092ab37200ec62402a3105c49ae95cff9cf
font_02_sfnt_off00013122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13122 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34