Malicious PDF — malware analysis report

Static analysis result for SHA-256 938068ef66c67466…

MALICIOUS

PDF

99.5 KB Created: 2021-06-05 08:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 678fd4d8e885a846b6d73ffd0ad0f794 SHA-1: e61c37f38e4d81e80c9faec01024ba33a4c76c3e SHA-256: 938068ef66c674662f4ab1c4fd34e32105ad02dfa4f9ebb3c0b1c99d10737ba8
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous embedded links, many pointing to disposable hosting services, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure strongly indicate an attempt to download further payloads or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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://wastran.ru/pbw?utm_term=que+es+la+concentracion+media+de+hb+corpuscular+baja PDF link annotation
    • https://guduzuzej.weebly.com/uploads/1/3/1/6/131606672/lujatu_kibop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369796/normal_60687469676ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420766/normal_5fe43da9d576f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387224/normal_600149e5956d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425504/normal_6052bab2cc7b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453329/normal_606037dc1f995.pdfIn PDF document text
    • https://dujizozobalosu.weebly.com/uploads/1/3/4/4/134470010/kanajidovof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371266/normal_5ff18d7885a27.pdfIn PDF document text
    • https://mujurusema.weebly.com/uploads/1/3/4/8/134846640/7611926.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373509/normal_5fcc0bf752c52.pdfIn PDF document text
    • https://vetigepar.weebly.com/uploads/1/3/5/9/135989985/c467d2afbe1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462688/normal_605cb3bda1938.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
    • http://dawanitapix.pbworks.com/f/principles_of_communication_systems_2nd_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f02dfca0-3dc8-4e44-a67c-fe855b114d98/whirlpool_microwave_oven_at_245_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d35473f-fc4f-4424-a794-b17f187f3ca6/dan_haerle_scales_for_jazz_improvisation.pdfIn PDF document text
    • http://zekodunu.pbworks.com/w/file/fetch/144628869/35361654291.pdfIn PDF document text
    • http://jejosuxiz.pbworks.com/w/file/fetch/144495351/wasiruvox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdfceecb-917a-4242-8c08-4cafdbbc8b76/taguguwineributes.pdfIn PDF document text
    • http://tasonupopam.pbworks.com/w/file/fetch/144597228/13172227769.pdfIn PDF document text
    • http://wigiwopajuke.pbworks.com/f/6475643372.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6b517a6-9998-4dda-a8b1-156222bb6d82/gitowokokefenovoveleje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4062d52b-a6f8-4bc9-822c-bb18ada200e7/how_to_do_things_with_words_1962.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_off000136d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D3 5472 bytes
SHA-256: 34c34490b7c429efbc77a6969778f3caa16675d4e5b5db4bd03727656473dcdb
font_01_sfnt_off0001492f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1492F 11996 bytes
SHA-256: f9bd5de6d771cc0835bd2310fd4aba3f8b872afacabe548c2828817731c52ab8
font_02_sfnt_off00017005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17005 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34