Malicious PDF — malware analysis report

Static analysis result for SHA-256 66f14683c8e02369…

MALICIOUS

PDF

69.3 KB Created: 2021-09-12 03:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f832c5d80627eb1792836eb23ec8442b SHA-1: 8885c45ca3b94d1b309ba6d8430efd52828665eb SHA-256: 66f14683c8e023692d8ce57faf2511ebab81da5aeda086ae995f9d90bbaa33ad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous embedded URLs pointing to disposable hosting, characteristic of a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an intent to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://crewmak.ru/uplcv?utm_term=gardenscapes+life+hack PDF link annotation
    • http://studioingegneramato.com/userfiles/files/47853180152.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/57944922109.pdfIn PDF document text
    • http://union-montage.pl/userfiles/file/26401630218.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/vanojogoru.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/67790796108.pdfIn PDF document text
    • http://snsi.jp/image/news_file/suxenapirijopopi.pdfIn PDF document text
    • https://ka-base.no/images_students/files/zedadakanapurogumowen.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/sejitetiwaravu.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/poxukemedu.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/45625437790.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/rataresud.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/89870901338.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/90794930090.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/risoji.pdfIn PDF document text
    • https://funbugs.ie/files/file/rimuzupenave.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-2/20210902233756881375.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa65266d81---76743938706.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/vewage.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351c7e52097---logekebifutiwakakuduges.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/31255410514.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/92568567522.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/dafamiguvojoru.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_off0000afd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EB 10632 bytes
SHA-256: 203c51c9f55a137525c6b71e92e90f435a61ccba65a5d56c001a27e23e13ce95
font_02_sfnt_off0000e018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE018 15628 bytes
SHA-256: 4982d27e323a472856eb6d81736deade64e8c0d1d9a1bf8fff5965032ef11f4f

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