Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac05247b8e6e516…

MALICIOUS

PDF

78.7 KB Created: 2021-05-26 15:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4a1dabe94709a80e15062b609695a5b8 SHA-1: 5460ef65834bdc372b44234be6fe46820b953797 SHA-256: 1ac05247b8e6e516d62c0bf5e5a77ad7f40566fab6008c01f3e22133334b3104
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The primary lure is an 'Examen diagnostico segundo grado primaria lainitas' which directs to a malicious URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/strik?utm_term=examen+diagnostico+segundo+grado+primaria+lainitas PDF link annotation
    • https://fudegenajeno.weebly.com/uploads/1/3/4/5/134581691/zimajof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417308/normal_600c43fe6cac2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402956/normal_602ed26c369c6.pdfIn PDF document text
    • https://toxisejaris.weebly.com/uploads/1/3/4/8/134851702/587f9853f04301.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473954/normal_5fe1acd3dda58.pdfIn PDF document text
    • https://wufanamokedig.weebly.com/uploads/1/3/5/3/135326106/bdcff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416792/normal_6017729ea379c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495846/normal_5fc7213018409.pdfIn PDF document text
    • https://fupiwopogewexab.weebly.com/uploads/1/3/4/5/134506550/gosolokuzodu_paroxepoda_vipadebaju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497369/normal_5fdbac20d08c1.pdfIn PDF document text
    • https://telanadiv.weebly.com/uploads/1/3/4/4/134495792/defb08a6767a7.pdfIn PDF document text
    • https://silixumofabu.weebly.com/uploads/1/3/2/7/132712413/majegalevusir-dupigekak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372983/normal_60323bbfcd5ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405903/normal_6032a80280c8d.pdfIn PDF document text
    • https://wedezetepeb.weebly.com/uploads/1/3/4/5/134528952/1fbcdc735164.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375690/normal_5fe8e4a09384d.pdfIn PDF document text
    • https://loligotobufineg.weebly.com/uploads/1/3/0/7/130739446/6552768.pdfIn PDF document text
    • https://sozeberanula.weebly.com/uploads/1/3/4/7/134774269/kipujim-sakuxax.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/46f2c4c4-e4fb-4800-a1fc-2c824b130e74/8847675029.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/735555d2-2470-424a-ac05-20c53e604e5d/xuzirilitevoka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43cb634a-c2a7-4d75-980a-c9c872f4c6a4/basic_electrical_engineering_book_in_tamil.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_off0000f26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26B 5420 bytes
SHA-256: 7fcab459d394d164d2b5ecc5699e3fdaec350169e3d19329f50754c95b9c6635
font_01_sfnt_off000104cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CD 12552 bytes
SHA-256: 83d401f2cce3484c2dd44edc8bca3bdd92c71feb3714feb34185eb88928923a0

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