Malicious PDF — malware analysis report

Static analysis result for SHA-256 1764228355d74de1…

MALICIOUS

PDF

78.7 KB Created: 2021-03-25 02:38:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 74fc5b1cf9475d4c4249638c0f8c6635 SHA-1: 3221287093e771eb47422f0972a638751ab1ffd1 SHA-256: 1764228355d74de10177ce1fb57750e764bdb8bc78bebe56339b9a38f4f221f2
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs, with a primary suspicious URL pointing to a domain associated with link farming and potentially malicious content. The document body, though heavily obfuscated, suggests a lure related to 'literary terms worksheet activity 1', indicating a social engineering pretext.

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://lozipotod.ru/wix?keyword=literary+terms+worksheet+activity+1 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4425235/normal_5fec836e75f08.pdfIn PDF document text
    • https://cdn.sqhk.co/muvasesuru/GjfiibR/short_funny_videos_for_whatsapp_status_download_tamil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479715/normal_5fd749fda764d.pdfIn PDF document text
    • http://kuzexamipapoxip.medianewsonline.com/audi_s4_avant_for_sale_canada.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369632/normal_5fc7e36ae9b37.pdfIn PDF document text
    • http://zumufufup.sportsontheweb.net/tusenor.pdfIn PDF document text
    • http://nibewubixela.getenjoyment.net/44577611735.pdfIn PDF document text
    • http://zememor.sportsontheweb.net/65105258896.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374369/normal_605843ef2423b.pdfIn PDF document text
    • http://xawegap.mywebcommunity.org/mixeteli.pdfIn PDF document text
    • https://cdn.sqhk.co/nalawanuxa/cjj3ggr/fall_guys_ps4_free_not_working.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/30_day_muscle_building_workout_plan_without_equipment.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lafagelupuf.myartsonline.com/49520267536.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b630f00e-6a51-474b-bc23-ac0bc603a99d/55829925394.pdfIn PDF document text
    • http://muluwokixo.onlinewebshop.net/164_nj_bus.pdfIn PDF document text
    • https://d71fc03c-aea6-48f7-a990-8afffb22108d.filesusr.com/ugd/3de8a6_7e2a9e3c24d24a5cba03812aef4f0fe0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/62c49585-0d70-4e78-b29d-d12ea7964e8f/cronica_de_una_muerte_anunciada_analisis_capitulo_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdeabbaa-17f3-4b51-9761-d6f193f57aa3/65187280302.pdfIn PDF document text
    • https://2571d5ef-7130-409a-b87d-c3fd18a83f30.filesusr.com/ugd/71fc55_84926b147b884608b321a2cb3b21dae7.pdf?index=trueIn PDF document text
    • http://watusatuvor.myartsonline.com/15902725811.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_off0000f760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF760 5316 bytes
SHA-256: 4e33b034e5a6c2ec6b6e6b61fed32f74da38bc27065d03d4cebfa7d0ef39efb0
font_01_sfnt_off0001096a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096A 10784 bytes
SHA-256: ab689ab80406e987c6f2ec781cd19dcfa6f832671fc0e155104c8677e310584a

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