Malicious PDF — malware analysis report

Static analysis result for SHA-256 244c10f01724a60c…

MALICIOUS

PDF

107.3 KB Created: 2021-03-20 09:47:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1b17e76dc762bf579c777b891827a34a SHA-1: d0da92df29548532eeee88470c377b80a1662eb6 SHA-256: 244c10f01724a60c3f8b05a9a238c72d0882e5a9058a03a97d034af2a284304d
126 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links pointing to various domains, with several heuristics indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://mezovuduw.ru/strik?utm_term=prometheus+unbound+summary+in+hindi PDF link annotation
    • http://tawaguf.scienceontheweb.net/24918462463.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456132/normal_6008ffd1c8287.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424997/normal_601ca7377d23e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460042/normal_6023d861430a4.pdfIn PDF document text
    • http://pajopoxofof.iblogger.org/bootstrap_template_react_js.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458389/normal_5fe3ac6ed5f18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375358/normal_5fe98a0210ceb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489257/normal_5ff57acbd57bf.pdfIn PDF document text
    • http://lafutib.sportsontheweb.net/dujerav.pdfIn PDF document text
    • http://zoguponuwuxoli.medianewsonline.com/govakozumenal.pdfIn PDF document text
    • http://xitodefigatefuj.medianewsonline.com/mafewuxegota.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390381/normal_602d443d42bee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/bogerezulax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08e6da81-8e86-40d3-9a2a-8e256d0c8749/rodojaforanileluxuv.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/hunchback_of_notre_dame_cast_cartoon.pdfIn PDF document text
    • http://xitutudatiri.epizy.com/countries_and_nationalities_english_worksheets.pdfIn PDF document text
    • http://zedofaxuboz.onlinewebshop.net/minoan_snake_goddess_museum.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/wozumivaxa.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/linozotasasogowizigaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7530b93c-3db1-4fcd-8771-a2b63409b2ec/verozinepi.pdfIn PDF document text
    • http://dekuravimej.epizy.com/symphony_orchestra_music.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/how_to_set_up_greenworks_pressure_washer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cec7c95b-a172-4c26-ab1b-cd9d690829a8/are_taco_bell_tacos_low_carb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e97c7a03-b99e-4057-9569-d3d09f4548b1/cant_get_filter_out_of_whirlpool_refrigerator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37db544a-8fa9-4229-b248-a8831ea99bf4/63789686721.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_off00016629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16629 5276 bytes
SHA-256: cc67d34522d59975205aa712c6e53caebcb1c4d599776f2b9149456bd62c83cd
font_01_sfnt_off000177e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177E9 11652 bytes
SHA-256: b69ffa4e06506d70f7338099049ad01288160b711a3bd014cd50506fdf428918