Malicious PDF — malware analysis report

Static analysis result for SHA-256 4391faaf046c43b5…

MALICIOUS

PDF

80.6 KB Created: 2021-09-18 07:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 82feb3f2fb4b4a0163a84a5a28715ab6 SHA-1: 4971dd4105271c7a0151555dd8d24af4a0c52aa2 SHA-256: 4391faaf046c43b5238439b1223be23e8a8d6d775ebc4fea19108a1094a26d4e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to domains that appear to be link farms or disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and the link farm heuristic indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://oniceh.ru/uplcv?utm_term=cheat+roblox+robux+unlimited PDF link annotation
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/jafotatikivedidanip.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/bowogadameke.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/25950878619.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/100353b9b4731a29bb9597b24e00d08e/narelixivo.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/24191440388.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/53638422576.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/68785029379.pdfIn PDF document text
    • https://123natura.com/stockages/files/vonajotubemegikifub.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/wenaxetakofak.pdfIn PDF document text
    • http://ahchala.com/img/file/ziwibebotowe.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210918083209.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210902212352.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e159e74b59---90360644520.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/95160371218.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/lewum.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/4469650028.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/rikuvesivelofomonef.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/newasami.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/32373779991.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/12737186728.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/15267733914.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/10587543036.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/84386575257.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_off0000d6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EB 10716 bytes
SHA-256: 0c7d91028bf77bb42d8e22091e83339e618b26e0fa29bcd4ab6ed9b921da624c
font_01_sfnt_off0000ef4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4C 17548 bytes
SHA-256: 6412b798b710d12eaebfeecfc3a869da0fd846feec9e385d1257a41b92017fb4
font_02_sfnt_off00011ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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