Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1e46ceda8f10deb…

MALICIOUS

PDF

70.7 KB Created: 2021-09-26 01:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d3cd5bd3b0c1549a8d9490e7dc880475 SHA-1: b6ee5e43f4b51645958b55e570d3b57d482fe392 SHA-256: f1e46ceda8f10deb13e11bdd1a60a838448895018533f0048abbad411d7b9477
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms, suggesting an attempt to direct users to malicious content. While no scripts were explicitly extracted, the PDF structure and the presence of external links indicate a likely phishing or malware distribution attempt, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://bongkartuantakur.com/contents/files/navulo.pdf In PDF document text
    • http://drivingschool-brno.eu/files/33260523449.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/sepidogupi.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/dixubapokibasutititow.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/90147788759.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/72733146125.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/83762448967.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/wupaduliredowosabazeb.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/voxabogiwapipuk.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/lalorefanusininemovo.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/14633219939.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/60332719950.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/96340598167.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/tadutamovunudupulix.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42627209182.pdfIn PDF document text
    • http://berbun.com/user_img/file/desetirolis.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/60244729431.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16130d0ba13d75---tefininori.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/nunelitaf.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/fibolesegezubejoxub.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/dowaribanatamujenajefu.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/bowek.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/wixopiwozogagovolefab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=comparison+between+apple+and+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_off0000b147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB147 10808 bytes
SHA-256: acb58851394539e6b4fbbd16148ab3de3fb9eaf9698c20597708b7cc9612d553
font_01_sfnt_off0000c9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FF 16840 bytes
SHA-256: 9d5f07c0c1af9b57427f31c77efac99dd15aac6e9fa98534e540bb2b5058aa21
font_02_sfnt_off0000f4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1