Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d9ae0a290033a0a…

MALICIOUS

PDF

77.3 KB Created: 2021-09-16 11:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ffc3e7a3c952fdbe976928d044cb1623 SHA-1: 1b9cc861e8e149c14164bc86023be08b4d31a848 SHA-256: 5d9ae0a290033a0a6fdabf3268f24f09d7b6b3fe41e451bf5b62ab2d61403e40
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's structure is designed to host numerous links, likely leading to malicious sites. While no scripts were extracted, the presence of many unknown URLs suggests an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://k2plusinterior.com/userfiles/vapadujozajavisadametat.pdf In PDF document text
    • http://china-baby-clothes.com/d/files/kegemumowetewilo.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210905101903214.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/5141917843.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/4323699813.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff9fecc7eb---42871737072.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/80930984765.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/30676641290.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/45029102390.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/rowolinedorapezebizutaden.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/2394991095.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/5570975036.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/bagozijilodavuxirinimarom.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/wekotelusugo.pdfIn PDF document text
    • https://rajaunited.com/contents/files/kefofowibizagufojaruguxi.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/21115023654.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/12816371072.pdfIn PDF document text
    • http://dr-temt.ru/images/file/zodusuritukafovesisek.pdfIn PDF document text
    • http://exms.fr/sites/default/files/file/87117591468.pdfIn PDF document text
    • http://monyetjoget.com/contents/files/42490997368.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/34338328753.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/57075050801.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/6823537482.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/85712928103.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/93597434410.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/xemipisudijoxibebitalare.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=app+to+save+music+from+youtube+androidPDF 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_off0000c7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE015 11136 bytes
SHA-256: 00ac9651d2cd6ae0bc7f2b2a3244d89a08a7ac62f162dce1eb6e6807ef0ad279
font_02_sfnt_off0000f9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F0 17384 bytes
SHA-256: 1a1bc6283ec1b38c991b1f4952b286c3bf2bb81d9e654430ac0c0bef1b186fb5