Malicious PDF — malware analysis report

Static analysis result for SHA-256 2844fd8a37a21335…

MALICIOUS

PDF

74.9 KB Created: 2021-09-18 07:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e681cbe7439689a880e23675e2c15961 SHA-1: a36d276215194d8d23c0340579b75dfa21dd29a8 SHA-256: 2844fd8a37a2133570a29b27d05293c044c3a5bdefc045ed9684d908b53c47ea
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. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were directly extracted, the nature of the PDF and its embedded links strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3185d964a---25688056469.pdf In PDF document text
    • https://ifbscalidad.eus/files/galeria/files/zuvidifegitudupalinajux.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/ligoromafawifana.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/34233956970.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/70879406613.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/85372486308.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/25730008356.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/84995261961.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/tinizixuw.pdfIn PDF document text
    • https://latework.cz/soubory/raxivoxa.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/90941629104.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/67105155963.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/luwokakevudamejaxeze.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/sejudera.pdfIn PDF document text
    • https://tigaintan.com/contents/files/namadesaxuder.pdfIn PDF document text
    • http://gespk.com/userfiles/file/rigawir.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/funaxelidokajajoxekoz.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/13264724402.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/48010832150.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/15880304557.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/barogipisuxekujexa.pdfIn PDF document text
    • http://schubert-hh.de/image/file/falozagadiso.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/silaxifikominizedexeva.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161390a7966178---rajilesu.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/22333c936b988e8ef524cb3f2d0a4cd1/24235961414.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=tel%C3%A9fono+zte+grand+xPDF 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_off0000bfdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EE 17608 bytes
SHA-256: ee13ce39d6db0b7a27470c25c2212f63655fcc471e668efc3289e345d8321f11
font_02_sfnt_off0001045d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045D 10548 bytes
SHA-256: cf4a06c61b34e1f679bc67e91b747efb44fe3018adecd16276c90d17550b6d31