Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e443a8ef991ef76…

MALICIOUS

PDF

80.9 KB Created: 2021-03-07 10:55:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 70b20439ea0704905783587c5057d1a9 SHA-1: 50967552d3eea59efec43c836f3769d78a36e94c SHA-256: 3e443a8ef991ef7667ca74aaa7530177ad8ed84912ea7372ea0bb895e43c9276
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous embedded URLs, with a primary focus on 'https://seumenha.ru/award?keyword=ansul+fire+suppression+system+inspection', suggesting a phishing attempt or a lure to a malicious site. The presence of many links on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/award?keyword=ansul+fire+suppression+system+inspection PDF link annotation
    • http://lobulezinovux.medianewsonline.com/62927420497.pdfIn PDF document text
    • https://cdn.sqhk.co/jokawefezo/TjjQijP/sejigewusikunijux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446264/normal_6033f7e87bec7.pdfIn PDF document text
    • http://jedilinosur.mywebcommunity.org/dowapag.pdfIn PDF document text
    • http://bebetadiruj.mywebcommunity.org/98784864802.pdfIn PDF document text
    • https://cdn.sqhk.co/dadakafopina/fhfjegd/takokigetagovuru.pdfIn PDF document text
    • https://cdn.sqhk.co/sunalikefazo/ejaieG1/formula_e_2020_championship_standings.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475861/normal_60110b15a98a4.pdfIn PDF document text
    • http://jujakivupas.iblogger.org/57760889511.pdfIn PDF document text
    • http://lakulikelanu.iblogger.org/zetimerogofefuzopo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jarunotaso.rf.gd/62317127018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caa15c50-d6f9-4cac-83bc-5084e4754e07/52813577233.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df5b34ca-8882-4ecf-9810-e11b8c31ac46/33634190188.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06e35e28-4094-4e5b-a246-841142c7090f/kavetipitevofuweginoni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9125371e-a9e4-4417-bca1-7800dcc2f662/57735275276.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/975c18fa-ad23-4dbf-9dff-e0e68350fb6d/60124181884.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b9914e9-cef9-44ea-b03d-d524d8bcd5e1/gusidobifizumadorad.pdfIn PDF document text
    • http://xadeboni.epizy.com/infection_prevention_and_control_test_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bc71157-5f80-475e-a7c6-99db9d2dbbf8/how_i_became_a_pirate_preschool_activities.pdfIn PDF document text
    • http://mapureju.epizy.com/metformin_overdose_lactic_acidosis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c36342a5-e609-4a64-baae-2bbed45f7995/32191834746.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e77997e6-ad70-4a73-adc3-9fac8f7e4327/computer_store_lincoln_ne.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_off0001015f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015F 5044 bytes
SHA-256: e25091710cba7caf096105ab009f7fec9ca34e6a065e2e5e9fbc8f7874b8ac32
font_01_sfnt_off00011284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11284 10476 bytes
SHA-256: 7cf31664ef0004164abfc391242a196eccb1cff6286375b948120ccfded6f766