Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed4820f1342494d5…

MALICIOUS

PDF

81.8 KB Created: 2021-09-13 19:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ec5027333a9642449c05462086421dda SHA-1: f339d6651509dc44c987b3499a0df8197ad9690c SHA-256: ed4820f1342494d549b22fc4ab4c51e86bf65765337d152c9dff044f5bf9b5c9
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1534 Steal or Modify Data

This PDF file was flagged by multiple heuristics as malicious, including ML classification and specific detections for phishing lures. The document impersonates PayPal and directs users to a suspicious URL, 'https://chcial.ru/uplcv?utm_term=how+to+hack+hotmail+account+2021', which is likely intended for credential harvesting. The presence of numerous external URIs and link farm characteristics further supports its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://chcial.ru/uplcv?utm_term=how+to+hack+hotmail+account+2021.
  • 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.
  • 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://chcial.ru/uplcv?utm_term=how+to+hack+hotmail+account+2021 PDF link annotation
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/42191104858.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/nuturikugedimel.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/guxuwizepetezibevu.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/38877288143.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/67163249229.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/sokamexip.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/33283194037.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/vifozebofes.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/35117939418.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/banukubuxika.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/58098237147.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613888bc29d86---28176820089.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/dugopomotodab.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/8684807675.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/679778239.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/wozebumagaranevode.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b349c59b16---47394417999.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/25248406597.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/sotusosofeb.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/23626697391.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/62276984400.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/rixoredusujupukigasix.pdfIn PDF document text
    • https://rajaunited.com/contents/files/zowawode.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_off0000d938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD938 17924 bytes
SHA-256: ae6a2bc561861171764e7a4c43f14fa81e241a14ff0f578e48faab009e3000be
font_01_sfnt_off00010801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10801 10660 bytes
SHA-256: a81c8c4c786a06a35611b8bca84254469b16db12949bfca5e9e70f12c56d3185
font_02_sfnt_off0001204e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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