Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f61a3f69516694…

MALICIOUS

PDF

81.7 KB Created: 2021-09-09 00:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c36dc5b00f1bb855a10dd9a6d0ace6b4 SHA-1: 88758b2d9a92e0e7406a621dcd8af10b06cebc60 SHA-256: 51f61a3f695166945e036fa03fbc6e8e179c280ed5f941d99efa7bbfb2729863
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. Heuristics indicate it functions as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains. The presence of embedded URIs and the overall structure suggest an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://nomylo.ru/uplcv?utm_term=test+automation+tools+for+android PDF link annotation
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/72406050888.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/xelusilufalokefulivebo.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdcde81aea---80151250932.pdfIn PDF document text
    • https://onecre.com/images/content/files/wonenabozova.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/bopijidofixodigaz.pdfIn PDF document text
    • https://tigaintan.com/contents/files/fomuxirafaradivuxibega.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/02/gomurubatikenog.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/92574142563.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/rixugabajawavenoxati.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/99974377699.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/20458707451.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1630683979.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/44967904281.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/tamabumexidobunesi.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210904_268EAED6B7DE24F4.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/75655274076.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/45312924389.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/rowevi.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/14500164075.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210903192045137.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210902_182017.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_off0000dbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCC 10580 bytes
SHA-256: f39403d7a82c8f4bff098ba136b4436fee7387b5baceeeab56afe442cd828da9
font_01_sfnt_off0000f3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E7 17332 bytes
SHA-256: 22618a6c361559f0b1c00530aa3c52bfd3b0f68635fb7b12fb189cf05a73a913
font_02_sfnt_off000120fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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