Malicious PDF — malware analysis report

Static analysis result for SHA-256 8933e744b77e99e3…

MALICIOUS

PDF

78.1 KB Created: 2021-09-22 20:33:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 75dfaf3faf228ac50b47f725c79475ae SHA-1: f7c99127c42b269433be5f9ef6c63c95fbc84c6f SHA-256: 8933e744b77e99e34c5bb32a53855d2bd4fc0bd4f1c2ea44f95cec4fd8dfbc83
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to a raw IP address, indicating malicious intent. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly suggest this is a phishing or malware distribution attempt. The embedded JavaScript is likely used to redirect the user to one of the listed malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://allytemp.ru/uplcv?utm_term=brands+that+do+not+use+sweatshops PDF link annotation
    • http://minhledtran.com/luutru/files/36964296512.pdfIn PDF document text
    • http://thietkevang.com/upload/files/95939538856.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/94698911518.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/74061351479.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/9319196482.pdfIn PDF document text
    • http://dc-3ed4d7413bdb.prshots.de/uploads/userfiles/1630532107/files/7274927090.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/modutawafimazebomu.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/kokozakikomevo.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410facca4db---dimemowo.pdfIn PDF document text
    • https://xn--dokumaanahtarlk-llc.net/userfiles/file/fosopikuresemetoliguru.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210912111910-12928875287.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/mititovozesesogizenix.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/97529558232.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/24162500092.pdfPDF link annotation
    • https://zenithservicos.com/userfiles/files/15895921609.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/1813871415.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210922190417500270884.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-9///2021911418398598.pdfIn PDF document text
    • http://perksys.com/userfiles/file/61315997096.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/26775799631.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/72045038987.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/gasusune.pdfIn PDF document text
    • http://kyea.org/imageuploads/malinokevomuxute.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/44505506838.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_off0000ca58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA58 18892 bytes
SHA-256: 25b2131c88bd029b553b9f04972c69e770ce03d6cc46afb27b5124264d349d92
font_01_sfnt_off0000fa0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0F 10588 bytes
SHA-256: 73e665090a90b941f06dce2e517b7904b28f20f41d529054d50f0b4d52ebdbb4
font_02_sfnt_off0001124a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1