Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba840bb9f546e73b…

MALICIOUS

PDF

84.4 KB Created: 2021-03-14 05:02:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d18c905d0400a572ee63a4a5dfa4a668 SHA-1: 1174363f5ac6519d660cf3e88231058d14dc5832 SHA-256: ba840bb9f546e73b5254470700708724b5b7bb8f73a26aa9f5ef13867a44fe7e
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 0.9997

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
  • 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://fokemale.ru/wix?keyword=hr+diagram+activity+answer+key PDF link annotation
    • http://crispyset.online/blank_periodic_table_printable_worksheet5eq5a.pdfIn PDF document text
    • http://olivamebel.com/death_road_to_canada_hand_upgrade5iu3l.pdfIn PDF document text
    • http://info-pages.ru/thomas_friends_adventures_to_shareoxm0n.pdfIn PDF document text
    • https://dudakodut.weebly.com/uploads/1/3/4/4/134497067/gewoguzaf-sasona-wulunibevevimev.pdfIn PDF document text
    • http://braco.ru/gunebulanejezemeqc29u.pdfIn PDF document text
    • http://tersq.fun/81736856201o7wg0.pdfIn PDF document text
    • https://regujimupakuve.weebly.com/uploads/1/3/5/3/135348903/1410189.pdfIn PDF document text
    • http://lynciguest.com/how_to_write_a_good_work_performance_reviewpofdt.pdfIn PDF document text
    • http://sdek-24.cc/bedingte_formatierung_excel_geht_nichtupa97.pdfIn PDF document text
    • http://bilkaita.space/object_oriented_programming_in_java_course_syllabus62wcf.pdfIn PDF document text
    • https://vifexaxelis.weebly.com/uploads/1/3/4/4/134482988/2160860.pdfIn PDF document text
    • https://dixodenifafazud.weebly.com/uploads/1/3/1/8/131856669/3497768.pdfIn PDF document text
    • https://vifexaxelis.weeblyIn 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/fojaxexino/2202232678.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c246a145-46a3-4a95-b080-ed51f473ac01/mcgraw_hill_accounting_chapter_6_homework_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3a2c02b-91da-4305-910b-15157f6b07b8/icd_10_code_for_compression_fracture_third_lumbar_vertebra.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/free_html_email_signature_template_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ed50e74-cf69-4bc8-821c-c67976a64985/pudawuzekugazunebikow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/164723c8-6fff-4ddb-a706-790a2cead333/2010_ford_f_350_maintenance_schedule.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/risk_matrix_template_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df5a550f-202e-4cee-a253-07322063cb6b/58357406011.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f520b0a-e4af-4db5-bade-0ac20db9b0d0/how_to_curl_really_really_short_hair.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_off00010abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABD 5504 bytes
SHA-256: e8ff309b3017cf48448bee250f9b4b42ce47973e5a8eebd36cdf37897456f7f0
font_01_sfnt_off00011d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D80 11452 bytes
SHA-256: 6c8f3f632d125ca891ab5b94b167862e729f4fb6521e33e96fce2e58df9f9e88