Malicious PDF — malware analysis report

Static analysis result for SHA-256 5619697eb52f3997…

MALICIOUS

PDF

76.1 KB Created: 2021-03-25 15:43:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1e71b216c8a06016004579c70d8b061c SHA-1: 4f97eb8deee81df3b8c47b8e926e6593d9df2776 SHA-256: 5619697eb52f39977fe3aa017931d53b8f5ed737d29c59431e16fcc7ebbbd63b
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, and heuristic analysis indicates it's a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/award?keyword=curriculum+development+meaning+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370073/normal_603e7c937a88f.pdfIn PDF document text
    • http://gprofights.ru/game_theory_applications_in_real_life9rf9t.pdfIn PDF document text
    • http://joblanc.xyz/introduction_to_mathematical_programming_mithiepj.pdfIn PDF document text
    • http://bagidopivulo.mywebcommunity.org/40925955425.pdfIn PDF document text
    • http://websporizle4.com/32995924898z3flh.pdfIn PDF document text
    • http://fionainthefield.org/label_printer_template_words7bvo.pdfIn PDF document text
    • http://tamakar.xyz/char_broil_offset_smoker_boxyvlhw.pdfIn PDF document text
    • http://rawiduti.medianewsonline.com/siemens_alstom_merger.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491152/normal_6021f7830cb35.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/f6c41d89-3818-4757-938e-6065db026175/laxodajoraded.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f15b062-6195-4946-84ad-5f6c793c376a/10021824597.pdfIn PDF document text
    • https://973697ad-ffa4-4f9d-85cd-0c9d1ea039ee.filesusr.com/ugd/5f5755_c488af7fce81429a94a89f407a84dd06.pdf?index=trueIn PDF document text
    • https://c06d174a-caca-4ab2-b5a0-4525cd3135d4.filesusr.com/ugd/856cea_3cf9dfd5bb36446db63686f1aef3cf8d.pdf?index=trueIn PDF document text
    • https://3437305d-a3f4-4f94-9a63-846dd410f5be.filesusr.com/ugd/ffe76b_f6c22f5fa5a7444f9209e3196f02ace7.pdf?index=trueIn PDF document text
    • http://sujunutab.atwebpages.com/someone_anyone_something_anything_worksheets.pdfIn PDF document text
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_f820fa51747c4f538315ef3850bb0d47.pdf?index=trueIn PDF document text
    • http://bavatesivo.myartsonline.com/bovunedepeni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77bf453a-ca75-466a-9f40-b0c6e07645a0/is_virgin_coconut_oil_unrefined.pdfIn PDF document text
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_5c65f48e84754cbd824e13d0694b9349.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/18fcd30a-9bbc-4795-b362-449dc1e20d9b/27556650881.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_off0000ebf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF5 5260 bytes
SHA-256: 7370eb74a38cbdf3a40bc6f81ecf89694d82c2c7188c1a3182f9849b80739a17
font_01_sfnt_off0000fdca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCA 11060 bytes
SHA-256: a1982148973e6b3a8c95a7ddf2de9296eb34a5d94b6dfd202744e0240e0139db

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