Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea3d9dac8be86f81…

MALICIOUS

PDF

76.6 KB Created: 2021-03-23 23:58:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8c347bd7d54ef18c80e6d48bccd854a0 SHA-1: 1e4947072fcf7f3a830408148e479385b7fff678 SHA-256: ea3d9dac8be86f818ed0e242f504a73e6db9f6e1f562a7f7f74eb8253d77dfe6
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The ML classifier also assigned a high probability of maliciousness. The document body is heavily obfuscated, but the presence of embedded URLs and the overall detection profile suggest it is designed to lure users to malicious sites, likely for phishing or malware distribution.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=violin+jingle+bell+rock+sheet+music In PDF document text
    • https://cdn.sqhk.co/gujowaxexag/fiatjag/10834792355.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375350/normal_601aee92d9339.pdfIn PDF document text
    • http://buyervannakupitvsem.xyz/ms_word_compare_documents_side_by_side3cssp.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/Oghieij/jenapi.pdfIn PDF document text
    • http://usmileofficial.site/50_essays_letter_from_birmingham_jailbrn9v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393925/normal_5ff1758a64027.pdfIn PDF document text
    • http://gemofesane.medianewsonline.com/40k_codex_download.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/2edb5c55-5e74-4d30-b2f6-d22d8968a93b/tetafuladubafolepevuti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/501981db-437e-4930-8e5a-8066971c8a3b/32308207512.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3aa9a53d-25a8-475f-828e-614b7676674e/does_co2_have_weak_intermolecular_forces.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01d61fe5-1e56-4c19-b1d8-1f30178f5f63/48344320281.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80c88522-858d-47fc-8462-c5c3d458e8a5/how_to_tie_knots_on_fleece_blanket.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35292d8a-6a4e-4407-92b3-15413a57a706/pumufaxoximiselokijumu.pdfIn PDF document text
    • http://bixozebaxikapos.atwebpages.com/analog_and_digital_signals_and_systems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fea71a14-4f3f-4f9f-90aa-1fb9a44b43a2/zusukorasisojubapij.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_off0000ecd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD1 5248 bytes
SHA-256: c34973b38e5cbef0410ab8a24aca8010fc8068153200a7304b9922d98c28832e
font_01_sfnt_off0000fe96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE96 11676 bytes
SHA-256: 30260524cb2f9df6efe1bbdcf4881afca8990501238ea42c30adb8e85ebd328f

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