Malicious PDF — malware analysis report

Static analysis result for SHA-256 efe8bcbb2396eb4f…

MALICIOUS

PDF

80.5 KB Created: 2021-09-19 05:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b269a906d93b73ea5f420d6e459549d1 SHA-1: f0ab735d9c3316da913f09ef7c801b659e6603d9 SHA-256: efe8bcbb2396eb4f2ee400507a58a903a8a1eea913c13d34434f6fcce40aeb93
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://kondicionery-shodnya.ru/upload_picture/file/23985588390.pdf In PDF document text
    • http://tehnicgaz.eu/files/file/zirobesodigusapoxikavib.pdfIn PDF document text
    • https://10fci.net/userfiles/file/kivixudikodovos.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/e1ba6c13f582602cc2a52619c790b03f/10130476251.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/riwized.pdfIn PDF document text
    • http://egitara.com/upfiles/files/dijufalutodosob.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/5799744095.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109111711377772.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/busurexifakafadixukobe.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/84340825899.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/vuwirusarifusidun.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/44702091689.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/kujadedes.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/50611373531.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/mesakibad.pdfIn PDF document text
    • https://termoformat.md/img/files/mizig.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/xofefireporiduj.pdfIn PDF document text
    • https://trystsalonri.com/images/file/sekenuriwidadefefagavi.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/74088736117.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/viximavupaxagajijinefana.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/3709889472.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/47209312478.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd5bfcdc48---80491801987.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/guniviz.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/22042992940.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=the+blood+of+olympus+online+pdfPDF 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_off0000d86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86F 16728 bytes
SHA-256: ebacd8abec79724b72470ce4d3757f027147507209ce469af1bc8a464c622347
font_01_sfnt_off000103ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C05 10720 bytes
SHA-256: d659518162448fd9a647d53a70d4a1ab09a30ec41a3ab9d69a63b619f9360662

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