Malicious PDF — malware analysis report

Static analysis result for SHA-256 63915ea4f2346adb…

MALICIOUS

PDF

74.4 KB Created: 2021-03-26 11:45:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 1157883b7312b9b879dd3f320d2478c0 SHA-1: 9e6094bc5f93abbe79c2541dd84a8550ab2f2cdb SHA-256: 63915ea4f2346adb94d0d0b908341a49cda893b5fb7af6ec1d974b9e097d55eb
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The document body, though partially corrupted, contains text related to nursing, likely a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/123?utm_term=clinical+reasoning+cases+in+nursing+answers PDF link annotation
    • http://reliables.ru/sogugoxibusxyja.pdfIn PDF document text
    • http://1pokypki.website/37709233814uu8e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402247/normal_601c796754ffd.pdfIn PDF document text
    • https://cdn.sqhk.co/gixotagokezu/VgfjidX/nepewato.pdfIn PDF document text
    • http://vurovolapoza.mygamesonline.org/que_es_analisis_estadistico.pdfIn PDF document text
    • http://vuzuwul.getenjoyment.net/guxurop.pdfIn PDF document text
    • http://sdfafq.info/semerituvut0kvr.pdfIn PDF document text
    • http://kalidejomepajo.scienceontheweb.net/88208391208.pdfIn PDF document text
    • https://cdn.sqhk.co/jowapezo/Xieii20/overkill_lyrics_colin_hay_meaning.pdfIn PDF document text
    • http://azules.ru/nemefalexufupasevekowrepr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446260/normal_601879af08972.pdfIn PDF document text
    • http://puvepum.getenjoyment.net/libros_para_aprender_a_leer_y_escribir_gratis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423460/normal_6033535cc4b52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415531/normal_603aef0ce5e34.pdfIn PDF document text
    • https://cdn.sqhk.co/vumorumuvogi/AGdjbvy/modern_warfare_2019_instant_gaming.pdfIn PDF document text
    • http://handler-autoscout24.com/best_piano_book_for_child_beginners7z7dy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405902/normal_601dc7bb4e3b0.pdfIn PDF document text
    • http://fudazozotakaxal.mywebcommunity.org/why_do_i_get_broken_blood_vessels_in_my_eyes.pdfIn PDF document text
    • https://cdn.sqhk.co/rebiguta/dSvG6ih/23145630597.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE546 4964 bytes
SHA-256: c3ff2f959fd06ef9637f5faf0a10e443264f193bb54c2221e66e90e2ed020b75
font_01_sfnt_off0000f646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF646 11376 bytes
SHA-256: 46690d9335abc33736531d099ace7d3e251cdab829a9294905fa7536ef9d0779

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