Malicious PDF — malware analysis report

Static analysis result for SHA-256 319239b5a4d0d686…

MALICIOUS

PDF

76.3 KB Created: 2021-06-01 13:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9075996dbdc585165343bee13dfb00fe SHA-1: 5943015d557fc4e007f3a6ac86863ba9b3115047 SHA-256: 319239b5a4d0d686b86749fb0380251fddbb12d51678ee525374e75abaf64f70
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 5

  • 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.
  • 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://medvor.ru/pbw?utm_term=is+dymo+labelwriter+4xl+wireless PDF link annotation
    • https://pusasosabuni.weebly.com/uploads/1/3/4/6/134654602/2106547.pdfIn PDF document text
    • https://mevagosulen.weebly.com/uploads/1/3/5/3/135391340/sumuwupuja.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/e7f141ce-ff0a-4bcd-b32b-f976b6a079c4/94577767344.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e279b4d6-7742-4569-95ee-23bb02f146ab/93525910951.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd31f055-926e-4860-ab41-3085d2166618/how_to_knit_a_hood.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf0be83f-7cde-4907-a706-8432fb52d34e/libert_paul_eluard_analyse_strophes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2e66f6c-cd08-45c7-ae04-17a13e494347/cable_gps_garmin_nuvi_2595.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acf27756-4fef-4367-8627-925cbb5a50e1/fat_fuzz_factory_schematic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/376be917-02ca-4c28-b555-386c72101e9c/repojokujofufezujinefe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/282c5edf-60c0-4765-8d4e-6323f854f39d/wabik.pdfIn PDF document text
    • http://bekivuxuga.pbworks.com/f/linagolejebogofilotam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a313273-45e4-4a9b-a21e-92106319234c/triton_atm_customer_service_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94241bd9-ffc9-4ff0-8493-3c8e183b97d3/how_to_use_architectural_triangular_scale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fef3825-9e30-4ac9-be7a-6b04992e10cf/weluxivuwoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cec1d892-eabc-43c1-b124-898dc3a6da95/stam_sorc_leveling_build_eso.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/f/lolozatojopanirapitanar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2764fb69-b583-4c4e-9d88-fba9c7107b1c/dareputowarofivatupedubu.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_off0000eaf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF6 5396 bytes
SHA-256: 693e35a88801ffee093494d6639723947d47849daa5b8342457006b6946b3f20
font_01_sfnt_off0000fd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD58 11420 bytes
SHA-256: 74f52d7514d33e453760315e76167b3f6372be8b01c92a23a70c6f67154cfb4e

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