Malicious PDF — malware analysis report

Static analysis result for SHA-256 81bb2528eaa60c58…

MALICIOUS

PDF

74.9 KB Created: 2021-03-07 00:06:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 850324b3bad40b712adc2befa98c4377 SHA-1: 4020b3e2f21ffeb4837efde77e720975158c6f9a SHA-256: 81bb2528eaa60c5885183774c7e7fcdb877510fe4f9b299bcdc24c8a228eb81f
226 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://resalured.ru/wix?keyword=different+types+of+pollution+worksheets PDF link annotation
    • https://cdn.sqhk.co/pobumepova/RpghUJ1/33609374729.pdfIn PDF document text
    • http://smilex.club/certificate_template_design_bordery2v6r.pdfIn PDF document text
    • http://mavpa.fun/wuwekimogipigejuw9jrpj.pdfIn PDF document text
    • https://cdn.sqhk.co/noxisoture/jihfjgA/nachiketa_all_song.pdfIn PDF document text
    • http://simcars.ru/97419627323vl7hq.pdfIn PDF document text
    • http://padlamadla.site/how_to_use_a_brother_xl2600i_sewing_machinep2l0k.pdfIn PDF document text
    • https://cdn.sqhk.co/xamozafi/hgMbbhd/wakexesefovokovejatigam.pdfIn PDF document text
    • https://cdn.sqhk.co/bupewazadufa/hd702ST/teacher_aide_professional_development.pdfIn PDF document text
    • http://daliadiago.com/petevaripoximucmdnz.pdfIn PDF document text
    • http://yourdesk.website/ordering_fractions_decimals_and_percentages_worksheeti5uhn.pdfIn PDF document text
    • https://gewavidabu.weebly.com/uploads/1/3/0/7/130775927/rofosixejavusa.pdfIn macro / runtime command snippet
    • https://cdn.sqhk.co/mugolino/nY4jggd/sudanawub.pdfIn macro / runtime command snippet
    • https://nebobaxewakizix.weebly.com/uploads/1/3/1/6/131637309/pavavevaxudov.pdfIn PDF document text
    • http://sodalabs.pro/nizudesuvimazitelaffngm0.pdfIn PDF document text
    • http://yourdesk.website/ordering_fractions_decimalIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/425cfbdb-9195-4bea-90ab-fdf7d9d9702f/gotusujanodebunetafuluva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7612deef-d27c-48c3-9133-13da5ab879d5/7650939186.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50f1d8d4-3120-4ec4-8809-a03d248ce85a/phrasal_verbs_esl_games_plus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9db22c8-5fd4-4c3b-9f7c-4c5801aa8f94/pimadudotoxajakokesumadab.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_off0000eae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE0 5036 bytes
SHA-256: 78d07654f7b4eabd14c01a225030189e666ac7b36bace2c4cd935a8fba563ad2
font_01_sfnt_off0000fc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC22 10080 bytes
SHA-256: 19e45b672964201dda3893600a6538e6af57789f0031e477c411cd17aeab0f38

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