Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c5c737cc7dc227b…

MALICIOUS

PDF

84.0 KB Created: 2021-04-08 23:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ea4f4babe7fdb0cb89183955339cfab2 SHA-1: 3a9f28c5588472f9c183401febf8830fe3a544f7 SHA-256: 1c5c737cc7dc227bc47b747ea043c68d352db022aab10f4a72505cedeaa95f3e
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The primary URL, https://xajibur.ru/strik?utm_term=list+the+3+types+of+business+operations, is likely part of this malicious infrastructure. No scripts were extracted, but the PDF structure and numerous external links are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/strik?utm_term=list+the+3+types+of+business+operations PDF link annotation
    • https://zoditasus.weebly.com/uploads/1/3/4/6/134670667/zadosekebog_vadofakelo.pdfIn PDF document text
    • https://dovezoluwebib.weebly.com/uploads/1/3/4/0/134017866/gudurozepux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494430/normal_603b237c67e72.pdfIn PDF document text
    • http://korecos.ru/how_to_turn_off_airplane_mode_on_doro_phone04u3s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391015/normal_5fe789bed0fdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413862/normal_600f641145e8b.pdfIn PDF document text
    • http://idealslimitaly.site/lewis_dot_diagram_chem_worksheet_5-7_answers3ppu2.pdfIn PDF document text
    • http://fifanaganogagu.22web.org/introduction_to_business_management_study_guide.pdfIn PDF document text
    • https://zatibuvox.weebly.com/uploads/1/3/0/7/130738619/1432645.pdfIn PDF document text
    • https://midodelawipage.weebly.com/uploads/1/3/4/5/134585137/lusogesa.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/3c5195ae-d1c2-48fa-9c02-0e77ab361525/what_are_the_hours_of_operation_for_walmart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a79baa6-ffe7-4695-af33-75c4e3ca98c5/33877620797.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53caa214-0487-403a-a059-c170b0fa9f0f/weber_kettle_grills_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2eb1995-8f8b-45f2-a34c-1bfe6a7b37b5/how_to_treat_your_wife.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19f0b7e2-0746-484d-8846-afa035554d1a/nobabijugetop.pdfIn PDF document text
    • http://kosirokuki.epizy.com/creation_story_colouring_sheet.pdfIn PDF document text
    • http://xapimiwosusuv.epizy.com/cavalry_charge_trumpet_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d023945-e97a-4eb9-a846-eae76ba98e2a/clinical_microbiologist_salary_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb5728f8-997a-432c-b278-e94cd2162305/87695141828.pdfIn PDF document text
    • http://nomikidavex.rf.gd/pejisezas.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_off0000fd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD01 5188 bytes
SHA-256: 553c69ab34a8cbc9700edcc58cfdc3243710ab0a8b771417c37f1a2ebd3195f5
font_01_sfnt_off00010e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E94 11236 bytes
SHA-256: 123d9d176ac5bc0a9767f790c5bbc4aa83be4057bbf5de9e61e5cd08c65d15ff
font_02_sfnt_off000134d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D1 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34