Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2445dba1ecdb83e…

MALICIOUS

PDF

79.0 KB Created: 2021-09-17 05:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 83b39d33239466e384ceff67f50c73be SHA-1: 708af569c9fb0b74050b87ea5fea49944b0b6c2c SHA-256: b2445dba1ecdb83ed4795e0c7a1960ac7118085f8aae9955a385db11e81b306e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, pointing towards a phishing or malware distribution scheme. The embedded URLs further support this, directing users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5815

Heuristics 5

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=hack+apk+of+shadow+fight+2 PDF link annotation
    • http://etabetasurvey.com/userfiles/files/28910897754.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/52605128761.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/pudijinefopuzupizeto.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-11/20210911215514843075.pdfIn PDF document text
    • https://shibbirs.com/media/files/58907225754.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/gobuturagapegomume.pdfIn PDF document text
    • https://e-casainteligenta.ro/userfiles/file/duxojeveseva.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/q2ehjdft24drpib5sg3n71fvd8/xagigizasasetojujub.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/73746012180.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/voxewakosojizavonad.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/92326620324.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/18692006035.pdfIn PDF document text
    • http://showpelec.com/data/file/20210905_092243_812.pdfIn PDF document text
    • http://trubaopt.ru/content/file/10157492146.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/midipite.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/78779760316.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/dibobojatasofo.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/67683717810.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/58311237147.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/visukigukebuxawejipe.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/kifurexopunumuki.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/83441754937.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/96540135317.pdfIn 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_off0000d850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD850 17580 bytes
SHA-256: ef4b762309f2118380136f0aa786b11056661ca7bb8e657e4618f299b8dee4a1
font_01_sfnt_off000105ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE1 10804 bytes
SHA-256: f824b4c61593742f2817e8d104a816f8d05481eb4e0da8f814971bc659a00d0d