Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea456315056f1144…

MALICIOUS

PDF

71.5 KB Created: 2021-09-27 05:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 713773cf6ed8ba52dbeb059c4dda98e8 SHA-1: 239879464f6ab5e1990cea3a42b46248777f69ea SHA-256: ea456315056f1144f0459748927a3707600df8c726df8575051e064bb062886b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs that point to external resources, suggesting it functions as a link farm or a phishing lure. The presence of external URIs and the 'link farm' heuristic strongly suggest the document's purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chcial.ru/uplcv?utm_term=how+do+i+change+my+android PDF link annotation
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/05eaffce4c50e39d3fd291fd3ea47e72/likunaf.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/kalopuladuso.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/semevoxetigisonuben.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109190216154919.pdfIn PDF document text
    • http://ozcetinler.com/userfiles/file/kesidikinenu.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/29904533347.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/38300341290.pdfIn PDF document text
    • https://melz-feu.ru/upload/40801288037.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/sawaluxowum.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7412a3897---mifik.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/geziboromo.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/zoveli.pdfIn PDF document text
    • https://stormester.no/files/file/junuga.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/85728837894.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/gisovelatanovor.pdfIn PDF document text
    • http://baovevietnam-vnss.com/upload/file/borabiz.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/62218273153.pdfIn PDF document text
    • http://chromavials.com/d/files/59284760868.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/58366606529.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210911100310.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/nivavisusadixisuxasemu.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/nofakeboseriso.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/63565356635.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_off0000b388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB388 17464 bytes
SHA-256: 25b2e23ef547cd78a445204f214ec42bc1a0ed253d94f5df2f6eabe52d37c189
font_01_sfnt_off0000e05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF874 10696 bytes
SHA-256: 7ffa470e3e32c9f9fc1ec5523a4f8bcc647d056170340090dbfee1412c2ba98a

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