Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b806ec61d4dc4c…

MALICIOUS

PDF

101.8 KB Created: 2021-09-24 11:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fdb8dd5e30dbf4aadb8fe1531b7cf0a3 SHA-1: e38903b6e3ee0f1a14a6115ffd5163113461795d SHA-256: 04b806ec61d4dc4c1ad7c5f8acfb2a373e847b0111ca4b46836bf5903a0abaaf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://goodfortune.hk/UpLoadFile/file///puforusuloxop.pdf In PDF document text
    • https://inks.bg/userfiles/file/83703920580.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/kesasewozipunifa.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/4899806043.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/56742070821.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/lufuwit.pdfIn PDF document text
    • http://ekosertifikat.uznature.uz/userfiles/file/94016749914.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/pavinu.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/jidexikitazine.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/2a49ccf62d6b608395a9fcb8a2c9c486/97520047713.pdfIn PDF document text
    • http://selidbe-beograd.info/files/48817325817.pdfIn PDF document text
    • http://ducthanhtam.com/uploads/userfiles/file/litosexuj.pdfIn PDF document text
    • http://dothi.info/images/files/70325106040.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/40808161814.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/35460831531.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/94682722850.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/32985058603.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/28905404710.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/namazojizemezabi.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/joditimujafidujotugod.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/82196796854.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/gojolefewemuboganetuzezob.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/56791348977.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=gta+san+andreas+data+highly+compressedPDF 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_off00012622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12622 19408 bytes
SHA-256: fc06af138feb6accc81b7a18f172017715a54195c1ab9c546b70c44fe214933c
font_01_sfnt_off0001577b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1577B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F92 11112 bytes
SHA-256: badbb46c101d7c6d1325082c50eb7a9ceb0ddd42cb1f48b391c22dcb9fd876cb