Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a41903f48f6dfeb…

MALICIOUS

PDF

76.8 KB Created: 2021-09-19 00:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: edbfa6be884d8f3875627d7d716d1e72 SHA-1: d3958d768fe9882b23ff8e8c1a9ba0143f39e804 SHA-256: 7a41903f48f6dfeb22d8b93a4e8c6b669d7ee072775d08e2b2842810809b74b8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The presence of embedded JavaScript suggests an attempt to exploit PDF vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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://philabc.ru/uplcv?utm_term=kindle+mod+apk+free+books PDF link annotation
    • https://trungtammatnamviet.vn/upload/files/pifirofilebezor.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/81799085671.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/tegimojuwutiranubipoke.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/de7b8fbf3e57e57db9c04194372e30ec/takegefewapikiz.pdfIn PDF document text
    • http://csp.hu/editor_up/21997608833.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///41925053370.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/17329718342.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/kizekakafakidin.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/zobagi.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/73498718399.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/xiridek.pdfIn PDF document text
    • http://catwalkexotique.com/userfiles/65881988096.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/sonunegerogogagofobof.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf205e5fd1---gapudupoxogivivunobar.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/35869654573.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/89991650128.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/94660062183.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/6066156126.pdfIn PDF document text
    • https://jensbrode.de/files/file/5877887098.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/83391564362.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/podumigixizozepirozusi.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/3478579129.pdfIn PDF document text
    • https://tessuno.com/upload/files/613b646e35ecc.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/lilidijitonusanewa.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_off0000c6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BA 10784 bytes
SHA-256: 612f229b935a16dee32bb97d4ff24543172566f1ddf3bc5c6f46d24e3a2951d7
font_01_sfnt_off0000df30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF30 17756 bytes
SHA-256: b7a959de18fc9cb35bfb1cd788853632388ba3fbf7e77d67ca96659c776a3b05
font_02_sfnt_off00010d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1