Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d41f906bdadb0a4…

MALICIOUS

PDF

77.3 KB Created: 2021-09-12 04:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f79bb4f7bd03b204711ba00d434b3285 SHA-1: c1956a6531233d2d0228fb4cdc801ab75e1eef0e SHA-256: 3d41f906bdadb0a4a478ca001b79780953122e49e64fa77b4f90c5f2c1c0b83c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a likely attempt to redirect users to malicious sites. The presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=tai+game+de+che+offline+hack+cho+android PDF link annotation
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cda22a0fc4---94260337415.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/81188431906.pdfIn PDF document text
    • https://flomogroup.com/upload/files/kabupijomoguxuzawifem.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/59701160757.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/90414640365.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/mapawaxilufulik.pdfIn PDF document text
    • http://joomlacode.org/fckeditor/editor/filemanager/img.php?file=file/28042240913.pdfIn PDF document text
    • http://planbmedia.hu/files/81278201434.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/zabinekemegokuwikasa.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/21535953202.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/xinumij.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161331342815cf---gejisuxuxasiwalixa.pdfIn PDF document text
    • https://svltv.in/userfiles/files/61286836262.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/pusesepusudodolozirezoxa.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/39378906896.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/31668156824.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/powikopim.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/44473644335.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/84842395387.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/govebimijus.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/17353386995.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/16587675372.pdfIn PDF document text
    • https://phnews.ro/files/file/30440363113.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/xipuvozezopuzavavafetuwel.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/ronagoguluzokan.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_off0000c308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC308 19384 bytes
SHA-256: b4f73e35d7a7815a2b6a89a1cba390f1fe09d63d9bfbf176a7fe37d38b6256f7
font_01_sfnt_off0000f6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED5 10712 bytes
SHA-256: 56d4cbd94949f11829aeee5da0dfa052dc2e821cf268850a1cad9b50ebc5ea71

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