Malicious PDF — malware analysis report

Static analysis result for SHA-256 b578ea2ecc444517…

MALICIOUS

PDF

83.1 KB Created: 2021-09-17 22:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6e4019c28565adfa61facac6a1537854 SHA-1: d81a586e63a488b75bd2e3e09ac3a2f6eb3809ae SHA-256: b578ea2ecc444517bf927b15a2efca82131ba8605e2620d1e420f04d10a5d9cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to a link farm, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicating a potential phishing or malware distribution scheme. While no scripts were explicitly extracted, the presence of embedded URIs and the link farm structure strongly suggest an attempt to redirect users to malicious content, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://cssh.es/img/file/getanoxijufejo.pdf In PDF document text
    • http://grandfiltr.com/files/file/rilodarumapanozawifopej.pdfIn PDF document text
    • http://midospa.com/upload/files/bofolawonuni.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/godobinumov.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/67537254481.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/rexokikuretifete.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/31815631337.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/fosekuxovadamaxodapovufa.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/nexupamuvajitibutejibiv.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/ligodozaropavozev.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/6403014873.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/31263352321.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/fejaje.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/zinikerakabajax.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/6800602382.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/jurojewivowinivumazojer.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/mifexazakulun.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/xukerozesobubokuxi.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/77619493778.pdfIn PDF document text
    • http://land89.com/ckupload/files/73806428590.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0d177ff20---94525233887.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1614420d699d56---juvanazedekepo.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/tiluwek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=auto+all+call+recorderPDF 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_off0000e34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34B 17252 bytes
SHA-256: 2086de1c2a4742b74fc5a6da6fd92f8822bad6f297ea445577170f1dec7da788
font_01_sfnt_off00011023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11023 10080 bytes
SHA-256: 79a29c0c310903f81680e2b93c6e290fd9bc0751d1d81afe3fd04d923b9b1b8b
font_02_sfnt_off000126c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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