Malicious PDF — malware analysis report

Static analysis result for SHA-256 dacecf65e14d2d78…

MALICIOUS

PDF

85.4 KB Created: 2021-09-09 00:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b8673c7fdc9993f9f4a649037c717d96 SHA-1: c607c06bdd88de9bc86130f4182210817dfb7064 SHA-256: dacecf65e14d2d781f2fbf835f9208e28d364eefa34fd46f6e6ac56cf1273905
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document is designed to trick users into believing they need a password for an archive, a common tactic to bypass gateway scanning. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://philabc.ru/uplcv?utm_term=como+borrar+correo+de+gmail+en+android PDF link annotation
    • http://chnli.tw/CKEdit/upload/files/15262918930.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/83897956792.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/zajunopuvenuvikolivogiwes.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/wejulijikunejekatenomit.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/zarefefujifetebalo.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613797f0a8163---pisugumogazerejigoz.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/64056303756.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/wojexafalamato.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/lipuxuvevidopototitasixas.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/wojikelujugerigaxu.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/6129473886.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613277cf38cca---63337883214.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/82202609378.pdfIn PDF document text
    • https://unaizahic.com/Files/files/pagosuwalabupajoko.pdfIn PDF document text
    • http://penetrat.ru/files/files/54837052042.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/69300125715.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/ninupowe.pdfIn PDF document text
    • http://1careglobal.com/upload/files/laromafulanututovamebetiz.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/94294625848.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/62089965525.pdfIn PDF document text
    • http://nature-revive.org/files/file/7136685734.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/37923144077.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/piwiwivegekewupesuzaj.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/86457881702.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/dokubefitaxowe.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/kisidoziti.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/xaboxinofijaz.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_off0000e39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39B 19884 bytes
SHA-256: 2c8a0ca9755c558258f12ab8f8cc489a4b6bbb0917c0689b7624aaf0b27483a9
font_01_sfnt_off000115b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B8 10616 bytes
SHA-256: 2cc6f66df4c5723da1b9d09f53cd74dbe7d75db31c717b51df976eaf4b5cfd5e
font_02_sfnt_off00012db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1