Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd60b7ad9cf937f4…

MALICIOUS

PDF

82.5 KB Created: 2021-09-19 07:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7d9d7a88ea1f8692a60613f33312d3f3 SHA-1: 8f0ec0d0b0d8bc071499f5e159ac127054ee9a65 SHA-256: cd60b7ad9cf937f4d70532861793f25e94ce73a809d4342d29e22fa5707ba34b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to disposable hosting. While no scripts were explicitly extracted, the PDF structure and the nature of the embedded links suggest an attempt to redirect the user to a malicious site, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133cf7092b87---1464919399.pdf In PDF document text
    • http://brickform.cz/obrazky/files/wivuxodupawokov.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/1759213f898207e11341585a7a393ee1/josuwag.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/xoruxutarubijipen.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/pabebodinufijanotidof.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/xafigatijiwigos.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210901122950.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/nikugizubefedabizaxif.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/womokakikinagezu.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/70633491784.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-6/20210906073515151397.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/7857872238.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/nifopedusadezuvu.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210904230648_1844872301.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/36857278366.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/koxewamupomunesodu.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/640020153.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/fetilamek.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/64639503312.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109082218163360.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/degabizewura.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/47376607655.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/tuvorubedek.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/67852029926.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/nekesewudozis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=what+is+perpetual+spinachPDF 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_off0000de75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE75 17728 bytes
SHA-256: 47cc4967c671142a1b459c6088a1c065a87b6619182967e58ebfc00ba1d3d443
font_01_sfnt_off00010c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C68 10444 bytes
SHA-256: 21da3ca5c5480336757b66fafc279c8ee7ac57afc278722809209376d355c0b8
font_02_sfnt_off00012417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12417 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1