Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f89bcf14ec4ba0…

MALICIOUS

PDF

76.3 KB Created: 2021-04-06 17:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2d2ad532089239700fea7e01a652aa51 SHA-1: c2019d29626103ec5939016d15a3ca32d4068708 SHA-256: b6f89bcf14ec4ba0fa288219ce95b2071f2f2f21e06824913b652e4fdd3c1e91
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 0.9997

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://dafemum.ru/aws?utm_term=play+scripts+for+high+school PDF link annotation
    • http://igbusinessabouthelp.com/hs_mini_maxx_tuner_update4xfh0.pdfIn PDF document text
    • https://cdn.sqhk.co/kinuneba/fic3ibk/8_ball_smash_game_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/nunemiziku/giolugg/pulejikaja.pdfIn PDF document text
    • https://cdn.sqhk.co/feripamapuv/MrYmZjf/natijefepu.pdfIn PDF document text
    • http://betijeduw.getenjoyment.net/nujijopasapi.pdfIn PDF document text
    • http://xovitixekewelom.scienceontheweb.net/software_architecture_roles_and_responsibilities.pdfIn PDF document text
    • https://cdn.sqhk.co/muwitajo/UBhjiis/pewemifodozaxurat.pdfIn PDF document text
    • https://kenolafopufa.weebly.com/uploads/1/3/4/5/134528829/78a497a0bc3676.pdfIn PDF document text
    • https://cdn.sqhk.co/tovozovuzedu/ji5gchh/xapozetasadawo.pdfIn PDF document text
    • https://vizosajigu.weebly.com/uploads/1/3/1/3/131381839/botuxaz.pdfIn PDF document text
    • http://kimokabif.medianewsonline.com/ford_mustang_ecoboost_review_australia.pdfIn PDF document text
    • http://flowerport.market/lipegu4jsvt.pdfIn PDF document text
    • https://sivubatololux.weebly.com/uploads/1/3/4/8/134850937/7861341.pdfIn PDF document text
    • https://cdn.sqhk.co/suwufuluri/ujbgjaD/63633619910.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/fN8RYMR/4_pics_1_word_7_letters_bridge_buildings.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f84ffea9-2755-49c2-9cb5-47ca8b55fe65.filesusr.com/ugd/0adedf_e3856718198d48928b1248099fd02fcd.pdf?index=trueIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_1ced09d1d8a345c59874b5c02c39f562.pdf?index=trueIn PDF document text
    • https://314a97e4-cc7b-499c-a999-42b15fb65c39.filesusr.com/ugd/fa4a73_32e7fbeea477466a8d938ba1d2fa6147.pdf?index=trueIn PDF document text
    • http://gefuwaw.atwebpages.com/what_is_the_babylonian_mystery_religion.pdfIn PDF document text
    • https://a35aa970-3e4e-4c20-be1f-53d10001bce9.filesusr.com/ugd/af4e73_9af02d6d9c0f4b2aaadc4e3eaaf905fc.pdf?index=trueIn PDF document text
    • http://rovizomaguwex.atwebpages.com/91658336105.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_off0000ec22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC22 5380 bytes
SHA-256: 4e604ff8403bd864e34155d216e17be4e75a696f00d8c961e4efd2d11ee2c760
font_01_sfnt_off0000fe7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7A 10960 bytes
SHA-256: c45b03e04b44d14032c9b7455a5dd3e17f6e8dd2cb56e10dd52799553132ca2a

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