Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea5ba2c769165f5e…

MALICIOUS

PDF

68.3 KB Created: 2021-09-29 09:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0965084618cf28f86d0f0a4ae78edad1 SHA-1: 7c218f45740c8806a6610b78200dcad2da531d61 SHA-256: ea5ba2c769165f5e0f2111ca2d3136b6b759c2d2209bca167324925b4fbe3a8b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a phishing lure with an image-only document shape. It also contains numerous external URIs, many of which point to potentially malicious domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to a phishing site or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://portoggitter.no/content/files/userfiles/file///vuraximoxefazuvep.pdf In PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/12596214672.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/nubemesubawegefab.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/rimaduxixobuno.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/sixakubolo.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/25210569239.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109082053438636.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/85892860787.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/63603673484.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6324bb6f4---57805896532.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/62090044896.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd4bb92c69---jusabewojexikiwebusatez.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/57939202647.pdfIn PDF document text
    • https://dragonexpressml.apnaconsultant.com/userfiles/files/lodoxog.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/69092282001.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/7957699817.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82198130720.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/sonaza.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/89209550661.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/lamemumikozanimiw.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///74849135342.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/bogilobegokufunuratu.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/lanufupawilemamazepitiga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+do+i+deactivate+voicemail+on+androidPDF link annotation
    • https://easyown.ddproperty.com/datas/files/bilurabowasixedili.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_off0000af39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF39 10508 bytes
SHA-256: f6546eeff2c99ea5f8d393f3d1d5acd8b4938074dbdd84161273290221890149
font_01_sfnt_off0000c711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC711 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF23 14444 bytes
SHA-256: 2eea517a1bf9309b5ef60c759d9f1cf7c37529a821fd967a9a12144d35fc5269