Malicious PDF — malware analysis report

Static analysis result for SHA-256 5afc253af317eaf4…

MALICIOUS

PDF

78.8 KB Created: 2021-03-09 03:49:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 01182f6b8d4672a00af04612085f8865 SHA-1: 933b3270fae7c7aae19c50cd4b60023d213314bd SHA-256: 5afc253af317eaf44a2cbe4145275434a667397dcccdb158207ea673d435feaa
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 0.9991

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://dugedepap.ru/strik?utm_term=brother+mfc+j615w+ink PDF link annotation
    • https://mumanewuneju.weebly.com/uploads/1/3/2/7/132712109/2178833.pdfIn PDF document text
    • http://lotibamuzuti.scienceontheweb.net/56560443987.pdfIn PDF document text
    • https://mafenipo.weebly.com/uploads/1/3/4/8/134879688/3303c812348625a.pdfIn PDF document text
    • http://xedeporib.medianewsonline.com/30052067321.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/de64ea0e-600d-43bf-bc05-78b09d1a5e2d/dajurijutatik.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/how_is_critical_thinking_related_to_media_and_information_literacy_brainly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33c3de54-0307-4fa5-acdb-03210f8d0677/regawu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/015329bf-a611-436b-ae13-04b9f6934203/how_to_study_for_usmle_step_1_while_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45f88030-cb05-483d-a355-7753d5510875/68665930270.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/anti-_personnel_mine_ban_convention.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/defbbe18-587a-404a-a7b9-ae3cb9d24198/imprimante_brother_hl_2240d_error_drum.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/the_canterville_ghost_italiano.pdfIn PDF document text
    • https://s3.amazonaws.com/dosipive/dell_2001fp_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/oracle_sql_developer_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/jamowurugisepofi.pdfIn PDF document text
    • http://jokubamobivavum.onlinewebshop.net/92154385428.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa7a254b-39b4-4294-93ab-4e33da501827/bezodamatijipupepub.pdfIn PDF document text
    • http://nufiwimuzobo.onlinewebshop.net/walgreens_automatic_wrist_blood_pressure_monitor_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8716ad2-26cb-473a-8dcc-b1aed273f37c/rajukagedowudetovewivuwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c88be0b5-9891-4016-8219-340acf666177/samsung_10kg_front_loader_washing_machine_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/vubekuxogunavutugi.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/nirazavodurenajudujezoxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69eddd13-4264-4543-b557-7a6ebb3ab41e/kunugakutavumajuponuben.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/applied_building_information_modelling_and_management.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_off0000f73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73B 5312 bytes
SHA-256: 36ccd1a96982438ca7b62f55d2833fa4d95346f6b11d2ddd4b45e8e84bb13282
font_01_sfnt_off00010951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10951 10920 bytes
SHA-256: 85235cf9276697de5a32f69b995f474d2094ef4c81318c4ddb3f95fba74c8da5