Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2782e1e56234da1…

MALICIOUS

PDF

80.9 KB Created: 2021-09-14 21:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7222e84be82e3c71001c032405fc28d1 SHA-1: c999b6fd9aa9caaf1ce5d19128cfc42f2cbfeb35 SHA-256: a2782e1e56234da1a9a27562aee704a3e89725e227e9c5921f1decb46b6be6c8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=usb+settings+on+my+phone PDF link annotation
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/19283175892.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/54424889579.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/digutexiwakogijotimuj.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1613be57eacabd---wuvazajotuwadizonixikizo.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/ninufikow.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/vipirixokafizofodur.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/33511929493.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/v3tg8l98oj83l0qfdmdamvcfai/vupikiwodizejog.pdfIn PDF document text
    • http://moneymaker-gold.de/files/7960160113.pdfIn PDF document text
    • https://hse.tw/upload/file/burunezewi.pdfIn PDF document text
    • http://voijin.com/userfiles/files/wadiwuvetedimilowur.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/12676130886.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/pilizelidarenadujojowaz.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/zizugoxi.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/vomofajesepu.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210912230137320.pdfIn PDF document text
    • https://unaizahic.com/Files/files/68251014212.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/28111878017.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/xunotusiwetukexogegoxu.pdfIn PDF document text
    • http://cudicio.it/images/file/naduvasufitig.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/tirozikowobiji.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/40040922703.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/moketor.pdfIn PDF document text
    • https://geloracinta.com/contents/files/72345528195.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_off0000d84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05F 17536 bytes
SHA-256: 2478152b6dee8d1d54c55f85641456048e9132ffcb01b38085ebfe85b8b9f786
font_02_sfnt_off00011db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB2 10652 bytes
SHA-256: dd875db0235453c0d82d32ba3f7fa1bbc0f8a703a42907e149b9fe599f8a3d77

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