Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b966b6a7389ba7…

MALICIOUS

PDF

80.0 KB Created: 2021-09-18 22:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e0fcdcac657f267b5f271dbee083040f SHA-1: 0df9f15793779dcd8f39b86ba80af09abb5721ec SHA-256: 42b966b6a7389ba78a8cbffd1416bb325978756493cd872f06cff7acf1ecda1e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm, and numerous external URLs are present, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/38a4b91c1f53fbc478e75420a3d48504/piwimav.pdf In PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/zigasutisele.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/jezozisuk.pdfIn PDF document text
    • http://oldstat.ww.tj/img/file/xatagakirisutogirob.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/58734852316.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/zufajafexoga.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/26635227433.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/poxovusizenavuw.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/53106059276.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/32836905193.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/mipilemofobuwunaxe.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/bugejaboto.pdfIn PDF document text
    • https://micsys.in/userfiles/file/zigovafolusag.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/d21c920cfee167c64a9b2ae2df9455bf/97463489073.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/pulupi.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/93816905542.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/dumasitexulizenefabij.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/38902683202.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/mexizavidudupewo.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/4535129766.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/56149505286.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/87687388859.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=cara+melihat+password+email+di+androidPDF 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_off0000d350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD350 18048 bytes
SHA-256: 85ce22e461bf53c2abf2da9812270ae23827f072fd575bfb735b148cf47a30e3
font_01_sfnt_off0001021a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A31 10772 bytes
SHA-256: b7b2a14c2740e1de65e392703f7bf380f9d1dfe370a8202b419fe55ef476a5d5