Malicious PDF — malware analysis report

Static analysis result for SHA-256 427a89538f568ca3…

MALICIOUS

PDF

81.3 KB Created: 2021-09-09 19:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ef6c0b829c05f50e04dcfa93552842d5 SHA-1: a9d3414082d40a9092b403695fba5bda957c1717 SHA-256: 427a89538f568ca31b6ebfa488bdaa54ecf0fec54666a724959cd78eba7ef60e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and external links suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://coretry.ru/uplcv?utm_term=watch+peaky+blinders+season+1+episode+1 PDF link annotation
    • http://mirutte.com/newsfiles/files/molixutovigenazofuxaxenug.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/8801534067.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/dutinigebunorugakaze.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/24337744016.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/zuboredudanakafip.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/lunilimadizuwunibisut.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/piduvejapep.pdfIn PDF document text
    • https://techlan.pl/files/file/87566010337.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/refewefolalujabisagemipaf.pdfIn PDF document text
    • http://cga82.com/admin/File/logonagen.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/begebuzijobajagabariwugaj.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/56795263298.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/jekami.pdfIn PDF document text
    • https://edgecs.com/documents/wagefavomamekasofoziwoz.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210906035012742.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/18079678816.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/melopudozefunitomemetor.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/70442108227.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109040107055390.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/71655830192.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/8651549650.pdfIn PDF document text
    • http://pedraferro.com/files/files/waroteka.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136160a14d27---11923980564.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD0 11004 bytes
SHA-256: 551dca6c4ffaf69495fb180c209f3020b3b4532a792d37251bb79269684b7fbb
font_02_sfnt_off0000f530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF530 16336 bytes
SHA-256: af7932cd5045fabb157d843a853a708e5f5a904e65001cb6c28b6d96e2ddb4dd
font_03_sfnt_off00011f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F40 16632 bytes
SHA-256: e896d0c9c6509c93731645541c0836c845742b74f7fde2e8ff5e94baacc6a6a0

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