Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbbd3c4bf1d0dcc8…

MALICIOUS

PDF

75.0 KB Created: 2021-04-09 00:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e7259207bbba00fb9c4a75673e6d8dc5 SHA-1: 69acb6fca7eb04d7f419a1d7ce8ef82d7b840c56 SHA-256: dbbd3c4bf1d0dcc8fdda01ed102c833dfba319ee727cebfca3f8f2d5fdca9991
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a LOLBin command-execution lure. 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 0.9995

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://baarspo.ru/strik?utm_term=can+illinois+tax+retirement+income+now PDF link annotation
    • http://balifruit.com/disiseniwadasonevesudrw59q.pdfIn PDF document text
    • http://alexsaf.ru/curl_of_gradient_of_vector_functione7geo.pdfIn PDF document text
    • http://bcpzonasegura10beta-viabcp.com/nulebolaxale1lnit.pdfIn PDF document text
    • http://tozofuji.scienceontheweb.net/interview_questions_and_answers_south_africa.pdfIn PDF document text
    • http://goodnaturak.space/big_data_book_free_downloadpnoal.pdfIn PDF document text
    • http://draiwenstore.online/jekesegelunovizizedubezuw4gu.pdfIn PDF document text
    • http://metalllift.ru/nixazasomikujamg6.pdfIn PDF document text
    • http://jilet1.club/muxoribetipelobokotitij1t7.pdfIn PDF document text
    • http://sowipilarow.mygamesonline.org/anatomy_of_heart.pdfIn PDF document text
    • http://sallely.xyz/jonilariw7vdr.pdfIn PDF document text
    • http://lowufadit.scienceontheweb.net/count_your_blessings_chords.pdfIn PDF document text
    • http://mudikovarew.mygamesonline.org/grade_5_math_practice_worksheets.pdfIn PDF document text
    • http://wogazufugid.22web.org/65489949787.pdfIn PDF document text
    • http://rimarilomikozu.medianewsonline.com/que_son_los_alcanos_alquenos_y_alquinos.pdfIn PDF document text
    • http://bcpzonasIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/68721200238.pdfIn PDF document text
    • http://lagazirixul.rf.gd/laboratory_assistant_book.pdfIn PDF document text
    • http://kalumewuvo.rf.gd/how_often_should_you_use_paper_shredder_lubricant_sheets.pdfIn macro / runtime command snippet
    • https://s3.amazonaws.com/jotogorurekuro/how_to_work_a_ge_self_cleaning_oven.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/korebage.pdfIn PDF document text
    • http://kigagizotag.onlinewebshop.net/vemodasuxozovafinit.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/45843430021.pdfIn PDF document text
    • http://giduzorim.epizy.com/bag_design_by_fashionary.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/46700619581.pdfIn PDF document text
    • http://delujub.rf.gd/70191529297.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_off0000e6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C0 5008 bytes
SHA-256: 2dd9c17ba7ea54bed22053f6287d5d11860a18aad232c09af961db520313bedc
font_01_sfnt_off0000f7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C2 10828 bytes
SHA-256: 0de4aed4c353519ebf3339c068bb11d6c91dc698be0b0878827b809326080d88