Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c2d6ca7cdad87cf…

MALICIOUS

PDF

83.7 KB Created: 2021-09-15 23:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f499353f320b79e24f307fda6a30c31d SHA-1: b49846fdd66113623a24e3063a0ef27f156ad17e SHA-256: 6c2d6ca7cdad87cf7a4ed01fd91f0cbdfeb458cd952a9d2104d6c4c3b294459a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, suggesting it functions as a downloader or redirects users to malicious sites. The PDF structure and the presence of many links on disposable hosting further support its role in a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://medvor.ru/uplcv?utm_term=why+are+rainforests+important+to+humans PDF link annotation
    • http://sicompk.com/survey/userfiles/files/dasanelipejenela.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210914_0284E959114891C3.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/xijujumodokigudi.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/pagunalurulurozulafi.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109111100212728.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/gefaxosufaru.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/51329774829.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/69421276015.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/25984567921.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/jovanokusibefefexalajezu.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/fipudofekaxekaliniron.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/lfusvco98sjq1ph23d333a5i3b/pobemenoxijimipekefuvo.pdfIn PDF document text
    • https://swiz.eu/files/editor/futadawudonafidud.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/15515476412.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/furogusurunanoxew.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/91208740160.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/26753464759.pdfIn PDF document text
    • https://majubesar.net/contents/files/73074768060.pdfIn PDF document text
    • https://thietbigas.net/media/files/10839163846.pdfIn PDF document text
    • http://pnalog.ru/images/file/892365001.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/34857197542.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_off0000e31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31A 17452 bytes
SHA-256: c0a371350a9768511601c61d491470945961a6dc3dbca1659f22f485e6b10eb7
font_01_sfnt_off00011052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11052 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12869 10784 bytes
SHA-256: 77f783d4b7751c722884e8703624b6d51c4b5992b07b2257caf146628f4d1b3e

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