Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fe11d021e2abd19…

MALICIOUS

PDF

82.4 KB Created: 2021-09-17 05:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 211ba11e3a0b8f1a6360e757cc4d6e62 SHA-1: 90231cf4658c65b6f6ece1ed80ee01fb98770d93 SHA-256: 9fe11d021e2abd19967bf9b2d36a8586c91cb12205386c5fa114238254c6f66c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://youxsoft.com/uploads/files/83728502979.pdf In PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/96558497348.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/texusekugewetilosunuxa.pdfIn PDF document text
    • https://ip-pharma.net/data/files/morawubatedanewopokado.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/puderewomuxujoposajebe.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/9070031922.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/didesovovopapijafa.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/d67010db616e5b013509fdd2cd09a51b/89521283554.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/muxebi.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/92029327693.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/vefivewanujibe.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/kawekavi.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/pixupivekibeborawamirexe.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210904/file/16307182351017.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/45777825413.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/1248523557.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/69763232201.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/32297949410.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/86044862716.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/pisisosatosaw.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/pugamazafitilunuwadetek.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/finujepolagemasuxerag.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/nevakalemakirowagun.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/33006534264.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=upgrade+windows+7+to+windows+10+2021PDF 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_off0000db82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB82 10956 bytes
SHA-256: 1af8113d994464650b481c9013f55606c14fba1d9a7ef985eeb82c8ef7de25e3
font_01_sfnt_off0000f507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF507 18176 bytes
SHA-256: ab4e158c2ee53e379238bbaee4c9dd986b43846c9f7a2012eadcadac906a4181
font_02_sfnt_off000123ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1