Malicious PDF — malware analysis report

Static analysis result for SHA-256 d754128b41566923…

MALICIOUS

PDF

72.4 KB Created: 2021-09-29 09:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fd04246a4209a7b1c13696abd63622af SHA-1: 4b529ffe0b105cba5f01b54bda61875c796f1b26 SHA-256: d754128b41566923d37b6b2382467c21f60aaadeb2d87ce540fa90ba4f2249d3
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to form a link farm. The ML classifier strongly indicated maliciousness, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a deceptive purpose. While no scripts were directly extracted, the structure and heuristics point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 4

  • 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 http://hodori247.com/uploads/files/38187058357.pdf In PDF document text
    • http://fbrasil.com/userfiles/file///68928783227.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/5506964307.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/60820099244.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/wetedojejizus.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/40751629059.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/89624763866.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/nipakubowoligiguv.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/rerukizega.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/liwuposuxefulifagale.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/70806783348.pdfIn PDF document text
    • https://eventaipei.com/upload/files/miponexupan.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/34668449455.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/rawijusawiwanudo.pdfIn PDF document text
    • https://bselink.com/userfiles/file/vajim.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/kikaxupojamoxepanovavo.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/3451566582.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/56364129881.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/tonabenaragivumonasemok.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/98454043402.pdfIn PDF document text
    • http://remobudostol.pl/pliki/nulifekafavevurefinoj.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/diwuwatanarapotipubizus.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/vajokafovowat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=download+shark+worldPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB41D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC34 10200 bytes
SHA-256: 428aa83b498cab775a0a7e03c2e5de89ceb5cb192db68a2057b8e20fd4077db3
font_02_sfnt_off0000e305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE305 19380 bytes
SHA-256: b9ba4fdf7649baa6bbb9f38e22ec66c14c50ddcc93edd17194cb012d148c7ac9