Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c7d95331339343a…

MALICIOUS

PDF

77.7 KB Created: 2021-09-13 19:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9d02ddfac7b4edf00a8e21b68262ce81 SHA-1: 4a0fdc3628320abba6e924f1c9cbf7db3649350e SHA-256: 2c7d95331339343a3819af25b20d8840b495c9cdc395934ccf119ed4223aa4d1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a pattern of disposable hosting. The primary purpose appears to be directing users to a network of potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://qdxqw.com/uploadfile/file/85380355789.pdf In PDF document text
    • http://djk-winkel.de/images/uploads/file/48302422204.pdfIn PDF document text
    • http://sbairs.com/datas/files/33248386325.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/49993842081.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/63088077913.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/bikefemazeka.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/xirenefuzux.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d80b9d3a57---letufixaxosurerudisa.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/62861253167.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/44804982977.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/tetagesaguw.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/zokaxudadawafek.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/63583129176.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/39c9c149db2e1dd7d77d8b5ecfed837e/80037602919.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/68694134353.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/pukupifufinilufuraxomot.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/zubafudewuv.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/pewimanetizamis.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/99709429878.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fufivemosisad.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/12181409442.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210909140303996238maiou.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/mises.pdfIn PDF document text
    • https://gangnampools.com/contents/files/89931579102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=intents+in+android+pptPDF 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_off0000ccbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D4 10288 bytes
SHA-256: 8d23f44f3f0a05a6793500e04f62ece505da33ac0e911429bbe88eaeee824155
font_02_sfnt_off0000fc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC15 17104 bytes
SHA-256: e37f123e15045b248eed8ef8bec61dc2838d05510693ec45051de2a7df9a1d59

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