Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f12349c438912ba…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 18:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6f274d06182a2022e1eefd589a7bddc7 SHA-1: 6d4563f29d2495d32e585988a79e757def8686c6 SHA-256: 1f12349c438912ba18399bb0da61901f2e41ec79bd0df4ab330ed8fe952d895e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to PDF files on various domains, suggesting it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy to distribute malicious content or phish users through a large number of links on potentially disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/6d6b6d90ca30bf28e9cf9c562d47af46/kigotoruzo.pdf In PDF document text
    • http://lab4050.com/upload/editor/file/vanubaterako.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/paramelaminavifavuzez.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/97429634951.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/97235284941.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210903_FF131C6AAF84172C.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/vasid.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/59150589863.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/nitiwizitugapuzodaso.pdfIn PDF document text
    • http://fedime.org/imagenes/92977690566.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/40361477788.pdfIn PDF document text
    • http://hydrem.ru/images/file/75343596772.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/pefomedotetuludigiko.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/kivagamozitadojotivi.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/fujipofiwolutu.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/86237776517.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/zuwimifixop.pdfIn PDF document text
    • https://izr.fr/files/zepirapanonufokutefifi.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/xemikosexajowobexizazud.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210907031837.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/42589378750.pdfIn PDF document text
    • http://harlit.com/upfiles/file/18347702688In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=watch+online+suicide+squadPDF 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_off0000d7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D0 10608 bytes
SHA-256: 430770e06d36110086c4ef7aafac79e5a1c9000e94afa6f2813537ff79bbdea9
font_01_sfnt_off0000efcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DE 19456 bytes
SHA-256: 69c3ff029ee77006997d6b7dc1ed640b2b296b137234efcba180b049b0c7a0ff