Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb3c659c7fabc90a…

MALICIOUS

PDF

77.4 KB Created: 2021-09-08 18:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 621075fb4bd91e6ee450a7a7ceaffb62 SHA-1: ece9aa36d95b9c731650aedc2db44fa7b0167d7e SHA-256: cb3c659c7fabc90ad0d7f90d3ebb7813ffa423a6529e3f6d4574dee2553dfd58
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to potentially malicious or unknown domains, suggesting it functions as a link farm. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a large number of links hosted on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://epilia.com/upload/FCKEditorfile/86906610098.pdf In PDF document text
    • http://donauwell.at/userfiles/file/jixeninireda.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/35388907080.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/dinebag.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/87986942116.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/zuwumilemosojunama.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/35633757387.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/bupovivojivurupabene.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/71612174425.pdfIn PDF document text
    • http://venkateshservices.com/uploads/tojatanixabu.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/fewapolirabamowisavojapi.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/xasufafurisaxorup.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/22988697978.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/47138234125.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/gopemujurumo.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/kofolanavujosowu.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161351d9e071f8---20697346182.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/53827498564.pdfIn PDF document text
    • https://fptica.ru/images/file/wolebipip.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/kogeziwegupaxurinukivi.pdfIn PDF document text
    • https://blogsma.com/files/tudonavufenipakamezavi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=he+is+able+more+than+able+chords+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_off0000c569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC569 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7B 18124 bytes
SHA-256: 0fa9a35bc58ee61e2b3c18b64990b12331b51288dca361370dacdb6014307457
font_02_sfnt_off00010db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB0 11016 bytes
SHA-256: e285a7da50bdeab8e77ae548d4c3e1f38225642fd76c1035bcdfa23bca4b21b7

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