Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1868e99d7c9dcff…

MALICIOUS

PDF

82.9 KB Created: 2021-09-19 19:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cd65d9ff33003388ae50f5a53d0140b2 SHA-1: dd5824170aab6ed5e07837743ad1d16b04192ec6 SHA-256: c1868e99d7c9dcff8a40f8c5d4fed57f9fe5c5565c8053183c0ed6d9d56feed8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. ClamAV and ML classifiers also flagged this PDF as malicious, with ClamAV identifying it as a phishing trojan. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pixomot.ru/uplcv?utm_term=magazin+play+android+market PDF link annotation
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/a90670daefe7002b4997a9f0fd6d5f0a/vofepigudu.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/ranitipogiku.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/78520464691.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/5884362247.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/soduzubosetifamevagobo.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/35053810529.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/mamatixiv.pdfIn PDF document text
    • https://ibextrail.com/editor-images/gerojewobosa.pdfIn PDF document text
    • https://simorgh.it/uploads/file/tusage.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/19658308719.pdfIn PDF document text
    • https://network-italia.it/file/japezanodosujivuxunuj.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/59276698010.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/zikifufobeg.pdfIn PDF document text
    • http://myslizdrave.com/soubory/18870542398.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/sigof.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/48472476744.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/82565827848.pdfIn PDF document text
    • http://paradoxine.com/upload/files/tusotobodujare.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/51342606100.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/wekupujetijanebuzawowabu.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/buxon.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/386c7a8eeb9f2bf9fe78b5ee57b0863e/sofutetefibafisuwege.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_off0000dfdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F2 10828 bytes
SHA-256: c686270de154fdb390dba34b888686a5e9b25a2c3a919c593da5da1098f5e966
font_02_sfnt_off000110b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B3 17348 bytes
SHA-256: 82ecae54c54c85e978357256b896e37ea06d1dbed61684c5f83c476fd91ddfc9

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