Malicious PDF — malware analysis report

Static analysis result for SHA-256 a24aa7f66ceead93…

MALICIOUS

PDF

84.5 KB Created: 2021-09-19 16:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 010d2abb026cfadbedafe9b8cba27a51 SHA-1: fe129c5278c871765b18e22f460d7549033ddb8c SHA-256: a24aa7f66ceead9345d9500b7572fab32517dbe464f431ae0e8c05a5440b8d9d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to other PDF files on distinct domains, indicating a link farm designed to obscure the ultimate destination. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score strongly suggest malicious intent, likely for phishing or malware distribution. ClamAV also detected this as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://haisushitogo.com/uploads/files/liwewaxifidokumajibito.pdf In PDF document text
    • https://mps-india.com/userfiles/files/jujidu.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/gupemogebowuko.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/muvolorewofalowewo.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/lilorupezapezijuxoxe.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/sakegukufabexudiwasetugu.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/wixisugara.pdfIn PDF document text
    • https://12shio4.com/contents/files/sozabiwu.pdfIn PDF document text
    • http://podarox.ru/public/files/gofuwob.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/5508107819.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/lalisapegigikibubem.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/87210985502.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/gafifarumofanedemurekeke.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/zidodowitijoxofuje.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/2676645569.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/bawumovido.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/povizasowedasifafuwoper.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/vekakeline.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/nigalijejojalunafuw.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/ralodagokabunadinekoguta.pdfIn PDF document text
    • http://nprofit.hk/userfiles/29076414238.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/wuzebuxekoxuta.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/69363076764.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109190327415593.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614313717a77a---42122956248.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/mutemewujarofewotorexud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=download+dr+driving+2+apkPDF 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_off0000e70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70C 17476 bytes
SHA-256: 9ac8b7b32827d364f922fb4d0f530dd6f420e513854c845a137b764f69ac480c
font_01_sfnt_off00011405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11405 10536 bytes
SHA-256: 162b96080b360908feec1b9b71d906c9e7ba23d80eac90f46b1e8318f9e6d7f6
font_02_sfnt_off00012bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1