Malicious PDF — malware analysis report

Static analysis result for SHA-256 63e5c29a48213a0f…

MALICIOUS

PDF

77.3 KB Created: 2021-04-04 04:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 167b786976ed718fecb8cad461b58372 SHA-1: ba3276093f5ac8e5db673b8f4fa2159ba0babda3 SHA-256: 63e5c29a48213a0fe62acfc646b46d5525e9b482e97c563a8c7bdf6ab1385592
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded links, many pointing to disposable domains, suggesting a link farm or redirection scheme to host malicious content. The document body, though truncated and obfuscated, suggests a lure related to educational materials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/wix?keyword=pronoun+reference+worksheet+with+answers PDF link annotation
    • http://tinesemexogo.mygamesonline.org/lobed.pdfIn PDF document text
    • http://zizodoroluxonaf.sportsontheweb.net/34540193075.pdfIn PDF document text
    • https://cdn.sqhk.co/zesozote/gljjHRn/6445555446.pdfIn PDF document text
    • https://cdn.sqhk.co/pelonulu/cbKie9H/19192121354.pdfIn PDF document text
    • http://zixonolugajona.iblogger.org/retrocalcaneal_bursitis_treatment.pdfIn PDF document text
    • https://cdn.sqhk.co/botuvawezej/h6ig0TC/datepicker_angular_material_format.pdfIn PDF document text
    • https://cdn.sqhk.co/turovonunido/hengfMR/28402961525.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/91d80e0c-2c61-490c-bb22-2db45936d7c7/the_twilight_saga_the_official_illustrated_guide_by_stephenie_meyer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76534de3-68fa-401b-82a2-cb88ec1c3f0e/resolucin_de_ecuaciones_de_primer_grado_con_productos_indicados.pdfIn PDF document text
    • http://widafasamuj.epizy.com/letter_format_to_apply_for_job.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97e3472b-a579-49aa-ad38-5a3bde599b7b/koxaj.pdfIn PDF document text
    • http://ponawalivemake.epizy.com/zifumuzovatofujuwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d601d36-bafc-4210-8cae-7a004153777f/family_therapy_definition_simple.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/biryani_recipe_in_marathi_information.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4240c4a9-5063-4511-ae8a-a0096102dc60/black_and_decker_convection_toaster_oven_replacement_parts.pdfIn PDF document text
    • http://rabelame.atwebpages.com/tebejiguwogiposaxo.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/53650778315.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a53ab14d-8a7c-4f85-8766-9b6ef9bbcb70/pujewagiroxuz.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_off0000f0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E7 5096 bytes
SHA-256: 88cddab11bd5ee0319a0694aa1c3a247c50f9dc804d98075815d46fc3da5d7d0
font_01_sfnt_off0001024e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024E 11024 bytes
SHA-256: 2b94aa3203a90fd75b426a12e51075625b691df80254d048c2d4a6c66e5a91a7

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