Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f0f72e4afb4f4c2…

MALICIOUS

PDF

86.8 KB Created: 2021-09-12 06:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4238a05569cc541e1652402abc936d6b SHA-1: 4ac59a46917a2ac5a428368859bce1138d839808 SHA-256: 5f0f72e4afb4f4c27e8e9c320ca07734fc6af52663ca603ea913d1e908233b29
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. The 'SE_CLICKFIX' heuristic indicates the document instructs the user to run a command, a common social engineering tactic to bypass security measures. Multiple external URLs were extracted, suggesting the document is part of a link farm designed to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://drafthe.ru/uplcv?utm_term=wifi+password+show+without+root PDF link annotation
    • http://beiks.info/public/file/zogumizosenubaw.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/c7363bae8e1dc899bf1b8bf95a8bf79b/xikigewubonetavabilakesu.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/konulubu.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/88092790121.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/69695778733.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/fulojuziwerudaba.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/89314199453.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/48806641714.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/tuwafufatikalo.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/5421871205.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/lorabipekifoxo.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210910_235842.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/pukisawiz.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/82bfb5970a37e285374fe237d83e22f8/rikapi.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/39760475263.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/67639148015.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/womesago.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/88861404105.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/wudubujodelelopaxujoji.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109082346165698.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210908_032933_113.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/42752223469.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_off0000ec78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC78 18952 bytes
SHA-256: 2c77d8aa38f7b085b9fb782ce4080b3633a1e2e82ab0d7f06be34fa759420f8b
font_01_sfnt_off00011e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E18 10492 bytes
SHA-256: b1ee83804c090e18ec556ca4bfabf27614eeca99f6e31e7ecd86da7f49695b5d
font_02_sfnt_off00013623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13623 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1