Malicious PDF — malware analysis report

Static analysis result for SHA-256 26cb9043a1571ebd…

MALICIOUS

PDF

84.1 KB Created: 2021-05-05 15:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7425f0a1080fa76d55efa89a47771750 SHA-1: 9040907a5aa93c788e3280a76491f4322929c6d3 SHA-256: 26cb9043a1571ebd6af12b2b555de265bbfb2ddf4fe6be8e124d3e79d8e8cea0
174 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kuzutuzo.ru/strik?utm_term=lds+come+follow+me+primary+manual+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379984/normal_60149e8ce4d35.pdfIn PDF document text
    • http://s-tochka.ru/college_degree_templated18f5.pdfIn PDF document text
    • https://xukutejupu.weebly.com/uploads/1/3/4/4/134487517/suxofowokarumu.pdfIn PDF document text
    • https://dodimugu.weebly.com/uploads/1/3/4/4/134483739/bumuvebadudasuk-zujamuwos-razifubov-kidozuvope.pdfIn PDF document text
    • https://suranekiwexem.weebly.com/uploads/1/3/4/6/134698667/7d13730effff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460057/normal_5fe96e594ba71.pdfIn PDF document text
    • https://toxobeveja.weebly.com/uploads/1/3/1/4/131437160/pufun.pdfIn PDF document text
    • http://remont-kvartir-otzyvy.moscow/raxobtipbl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466161/normal_602b2cb39776f.pdfIn PDF document text
    • http://i-men.ru/83511150184p7kb7.pdfIn PDF document text
    • https://mewibanomerazam.weebly.com/uploads/1/3/5/3/135348120/dawovivifazib-fijosi-kojesed.pdfIn PDF document text
    • http://fc-aromat.ru/974346929420ugr2.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://uploads.strikinglycdn.com/files/1965dd0d-6cfc-4248-855c-4cf162ab81a3/baguwakimapabewivawen.pdfIn PDF document text
    • http://pipovafalalum.rf.gd/allied_health_professional_council_permanent_registration_form.pdfIn PDF document text
    • http://bozexefuj.epizy.com/azimuth_thruster.pdfIn PDF document text
    • https://5f98d79b-b704-4ecc-a618-200e52db7f79.filesusr.com/ugd/d1a5b7_d7a91fb3f5c544b18e5f7fc1bc5adaa2.pdf?index=trueIn PDF document text
    • http://fuxopipojuwepi.epizy.com/transport_across_cell_membrane_lab_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/837b9479-a392-4f02-a422-7daa38fd232c/black_and_decker_battery_hedge_trimmer_uk.pdfIn PDF document text
    • http://roxipumemo.rf.gd/modle_de_cahier_des_charges_informatique.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49fd155c-804f-4bd0-bbc6-801d341fb357/dell_inspiron_15r_n5010_bluetooth_driver_for_windows_7_64_bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0cc5b2a-387d-440d-a459-92b593c29dae/how_to_reset_samsung_galaxy_tab_a_if_you_forgot_password.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09e94ec1-951e-4d1d-8f21-4918ebf1bd90/ratuwowevifatotilijejed.pdfIn PDF document text
    • https://44034db3-6cdd-4729-adf3-7ccd6afcf354.filesusr.com/ugd/9fe9cc_8949b73a7f024523afddd41cbfacd684.pdf?index=trueIn PDF document text
    • http://radulamuwufudez.epizy.com/career_goals_essay_examples.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD4 5512 bytes
SHA-256: 1d85f3833f8eeb0fb184616a865b90bbe09110579c0854b5a22c24ca2d434e44
font_01_sfnt_off00010d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D87 11340 bytes
SHA-256: 091b09deaef6d386122148dc36b0c2d6f6806436ee90df9879a8c077da0e3ce4
font_02_sfnt_off000133f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F9 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230