Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b35cc2ee0b277b…

MALICIOUS

PDF

108.7 KB Created: 2021-04-28 13:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f5bd36557367c2408f454c520af58516 SHA-1: 8c0057ec1f98eed45ac2f3adcc77617b7a49dde9 SHA-256: 85b35cc2ee0b277b29d8c03e460f730b42db815d6dd2cedc9519fe68fb3201e3
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9899

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://soxebez.ru/strik?utm_term=garmin+430+for+sale+canada PDF link annotation
    • http://copyrightshelpcenter.com/12200873358gg9ge.pdfIn PDF document text
    • http://jusapp.club/67588918220tmezz.pdfIn PDF document text
    • http://pycnidwzxc.info/antutu_benchmark_apk_uptodownoup45.pdfIn PDF document text
    • http://ecosbor.net/the_white_tiger_official_trailer_netflix0jvkg.pdfIn PDF document text
    • http://eurofamily.pro/restorative_yoga_poses_for_third_chakraellmo.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
    • https://878ee1be-828d-48b9-a24a-84283cf66a1c.filesusr.com/ugd/86936c_b9e82c348bb1460a90affd3e82be5470.pdf?index=trueIn PDF document text
    • https://42172c5f-463d-425f-bc49-3536d5e9b788.filesusr.com/ugd/3e9aab_1c4dfd83aa6649bbaf267242bb0167b5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/70006a8c-8197-4b2e-b5b7-27bc897e5002/87782976063.pdfIn PDF document text
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_93fb8eca2d0e47a88adb3b1d4eddc72e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/remavuj/midatene.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/car_game_for_android_apk_free.pdfIn PDF document text
    • https://82e7f058-9c2a-4352-8e65-a162d98cde11.filesusr.com/ugd/ba3c76_f626fb7f9525403abaadfd386897efca.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/69e1a4f1-4bba-41ee-bc69-132f5c4ee32b/acido_cloridrico_formula_quimica.pdfIn PDF document text
    • https://b86313a8-447b-404d-ae6d-bc69740d899e.filesusr.com/ugd/e54fc7_8ed59e6d9127476aaa2beef92433169f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/04c0aa22-2392-483d-8cbf-ba78a2a0a23a/xbox_one_controller_bluetooth_not_pairing.pdfIn PDF document text
    • https://123949be-7110-4ba3-a240-a7df06fb38ce.filesusr.com/ugd/80fd5d_e1d3a0db2d044b099512fa2567dca69f.pdf?index=trueIn PDF document text
    • https://2c9641c8-5874-4869-9b94-f1378e60aa6b.filesusr.com/ugd/efc1f6_df29593cf9de4f58ad0303ee2435164e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddc3691d-df65-48b6-9b7c-9f77986b94dd/do_all_2016_ford_focus_have_transmission_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abcf0887-7eb0-4102-91b7-49ce9e5bb762/which_routing_number_do_i_use_for_international_transfer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e3e1679-a447-4fc3-812e-e5f076045e31/somewhere_over_the_rainbow_cello_sheet_music_free.pdfIn PDF document text
    • https://123949be-7110-4ba3-a240-a7df06fb38ce.filesusr.com/ugd/80fd5d_f4ff865ce2a0404ca7f0d9524cd36082.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f212988-428d-4c14-9638-91da260796ea/kunulisewoboruj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c3f33b8-8623-4b98-89db-4586219ec5da/badosezakobizoxin.pdfIn PDF document text
    • https://89d37d93-eaf9-4fc7-8d5e-07438b8f18e7.filesusr.com/ugd/e80f4c_8e89acd65c0f4a7fb1f6a4fd0a1e5159.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ritoma/lack_of_uniformity_meaning_in_bengali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfb8a9ad-464d-46e7-a3a8-98fa92110249/sozibunegup.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14181 6544 bytes
SHA-256: 9eb65cbf707aa96b5c6e94057070ea2e17067c53b659868ff2ab076ab9daa0a6
font_01_sfnt_off000157c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157C4 5300 bytes
SHA-256: d5f74b06242736f3fe7735b0884845b082214ed0f40f706160441e08df36d56f
font_02_sfnt_off000169a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169A7 12920 bytes
SHA-256: b6bd79710619113afbc743d8150b9323b3639cb691c84e8851ea396536762ee0
font_03_sfnt_off00019527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19527 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e