Malicious PDF — malware analysis report

Static analysis result for SHA-256 af93ef8c59636a71…

MALICIOUS

PDF

69.8 KB Created: 2021-09-27 18:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1a775f45d539f620f575129cb78f4541 SHA-1: 6f18d0112d02b3d5036b11078327062c165df8e4 SHA-256: af93ef8c59636a714d18fc97ba4e77adbadc2ba762230e9e65a7768fbf409754
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of a link farm with numerous links, many pointing to disposable hosting and utilizing UTM parameters, suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://halmar.info/userfiles/file/15493039034.pdf In PDF document text
    • http://romangruszecki.com/uploaded/file/bokarafika.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/59492e6a9a3a732ddfd7f8a8780b7812/92529326773.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/lexisorukup.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/zikeno.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/51726019374.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1631767537.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210916095241.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/47594515622.pdfIn PDF document text
    • http://learningkey.org/userfiles/40907924911.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/gubudukofalopaderur.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/duvarit.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/mozekepizuj.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/71725053140.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/56f5462a3f91f6305e41f2f6d7ccabd8/mevosatemogagolumomipomi.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/kaveludewonakazewusewaze.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/23549114137.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/83889944868.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/6632560602.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/25249012683.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/visatoxed.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109141205481747.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/nujutukalilafelanugarizox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=vidmate+apk+download+original+versionPDF link annotation
    • https://mediaget.com/userfiles/files/nerujifabisajulaxeta.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://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_off0000afa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BD 10948 bytes
SHA-256: cced5edfe65dddd19a4f96c590dfd52702b1be43553079a379def6f73911446e
font_02_sfnt_off0000e0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EF 16048 bytes
SHA-256: b985a5e4a58228aee26a269ce111344847b9de7578fe7fcc42ac88f453469378