Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dfd1d5646634bb0…

MALICIOUS

PDF

75.3 KB Created: 2021-09-21 02:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5f561a8f911d57f25308176c29ee6186 SHA-1: ba5ae7c8d732f28622c015baa366eb6c8cb131c0 SHA-256: 9dfd1d5646634bb0809a0f18c3618a68a1b913a461aefa5f7bf2e9856fef1894
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/uplcv?utm_term=apk+hack+dragon+mania+legends PDF link annotation
    • http://sireny.net/share/files/45297668481.pdfIn PDF document text
    • http://farashimirooz.com/files/bipuvadomitixarabupufis.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/44375460377.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/mojanig.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412393cb724---78485362646.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/simunilovorukume.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/zalane.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/dofotelazupasofisujula.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/40728850681.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/91003115142.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/75016836516.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/balosudebesezax.pdfIn PDF document text
    • http://imaginove.eu/data/Files/birosenokiluretoginepor.pdfIn PDF document text
    • https://fishboat.hr/files/94237599037.pdfIn PDF document text
    • http://lawngo.net/fckfiles/57797734474.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/404f179153d9ccc79302a8142ebdcf97/42644493130.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/netipafusoxulafu.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/zugivokipojufukeravuruse.pdfIn PDF document text
    • https://ptogel2.com/contents/files/62876597836.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/15750611788.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/fupirugopafizejotud.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/88497636977.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/kagozew.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_off0000c320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC320 16976 bytes
SHA-256: 7afe9b8b9b0917d29c38048f1f609e9e7048cff9bdfe30198889763b952eb873
font_01_sfnt_off0000ef08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF08 10936 bytes
SHA-256: 2af399a60a7840708f4d140eb4ef905cf8172cfea05d80b28bfa19874386f859
font_02_sfnt_off000107ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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