Malicious PDF — malware analysis report

Static analysis result for SHA-256 effe2e320cfc9b9c…

MALICIOUS

PDF

74.4 KB Created: 2021-04-08 14:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 89ae8a041348eb70238f2ad259864d47 SHA-1: 29657697dac1988e56a7f0e3a0406ac37ccb1b4c SHA-256: effe2e320cfc9b9c6b2dfac14de95d2f7b672e766c9b0d685db056acf1300b36
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malicious redirection attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=shimano+di2+ultegra+upgrade+kit PDF link annotation
    • http://datingdate.site/hp_probook_4530s_laptop_drivers_for_windows_7_64_bitr93e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480728/normal_5fd677667a8b1.pdfIn PDF document text
    • http://kuvofejom.iblogger.org/airline_inventory_management.pdfIn PDF document text
    • http://presentinsta.online/fovaroxevase3isim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503309/normal_604335aadc50a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tapopopabe.rf.gd/mofojoribopibizakiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc8252bc-69c2-476d-85fb-308b65a4afae/22809169840.pdfIn PDF document text
    • http://dunedobaxapekir.epizy.com/difference_between_android_tv_vs_smart_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b07265c6-406d-45a5-9739-f972b2b74251/gufeniwenujoz.pdfIn PDF document text
    • http://vegobojogaroju.rf.gd/45345358319.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfb228d4-cbca-4bd7-9e52-dd2842747626/sinusamonetebu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/212546d7-675e-49d3-a22b-bac5202fbf6d/vorekuvejekitinalesufizuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/704a66e3-1636-4d2e-a02b-70bf1960c9d4/do_i_need_a_masters_degree_to_be_a_data_scientist.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19d2e919-aebb-4f79-afc6-9c5e8a79eaaf/zuvuwulezefowemodipofugip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9274ed68-b5d5-449f-bce1-2e918d0bd4e0/scag_ztr_mowers_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48b53f78-a29f-4aa3-ab37-785555bbd5a6/what_are_the_keyboard_shortcuts_for_windows_10.pdfIn PDF document text
    • https://b1394492-4877-47b1-8bf2-e962974baa99.filesusr.com/ugd/3e4b7a_8884671e8ebd4818bf2e5febe012a25c.pdf?index=trueIn PDF document text
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_73462c12ef9e45ffbd9870d8638cfa62.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dc9c102-44eb-422e-b4e2-f9902d120fa7/brother_mfc_9970_toner.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_off0000e4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EE 5496 bytes
SHA-256: aeae0dfb4cebe7fd5d255363502f6b79f78cef5da37bb1174d4a8f0beafd2933
font_01_sfnt_off0000f76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76F 10412 bytes
SHA-256: 9bb003fe9ac1e112688bd759cea77530c7ae5b308b86bc6ccd511c52036e06d9