Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc80eb8d9d9e518…

MALICIOUS

PDF

68.1 KB Created: 2021-10-01 16:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ff25fc2885ac3c95441641acd031b97e SHA-1: 1dceaff113fbff5a0d2fce5a4f78c6887ba68af7 SHA-256: ffc80eb8d9d9e5187712aab8bbcd9412f83c5b04b0865b2c5fbc56641618ef19
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 functions as a link farm hosted on disposable domains, directing users to various PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 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://philabc.ru/uplcv?utm_term=como+desbloquear+um+celular+samsung+com+senha+pessoal PDF link annotation
    • https://buyafranchise.org/files/files/kotal.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37644766463.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/fesizaguxamibidegaf.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/legojiweru.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/xiluz.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/jarujobejiwotawobaw.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614e90a1a059c---lefigesuwabopalose.pdfIn PDF document text
    • https://liguecasa.mmsfoot.com/stock/file/40751174131.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109080205114795.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/mubadafamutawu.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-27/20210927150700586642.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16143861b9abf7---23030665429.pdfIn PDF document text
    • http://stl-hk.net/userfiles/9422363647.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/35557486949.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/94117188827.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/29197249323.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109031744032693.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/xoragomawovipujobodukuvij.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/7369513566.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/70312428279.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/gusesewiluga.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/71351910983.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/dafexovonosoxefoz.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/jikebogarigewegorotomanup.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_off0000aded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADED 14592 bytes
SHA-256: f87905c4cb1bae83e473cf4b2c394fc7c321297c9fe9e24771ecba5fc26a4968
font_01_sfnt_off0000d1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BC 11188 bytes
SHA-256: c86415afce56df51a11052fffc4b36867f0892bce941a9b421832dfebeae445f