Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cf716004b9755a6…

MALICIOUS

PDF

84.6 KB Created: 2021-09-14 07:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 789337cfdfe96468a29c90c1f642804f SHA-1: 8bafef568dc4429d79586db5583e1b676fc6dd2f SHA-256: 2cf716004b9755a66f842f698d0a99a8f228c982e658e8019144310dd343e860
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristics reveal it functions as a link farm, directing users to various PDF files hosted on different domains, likely as a lure for downloading malware. Although no scripts were explicitly extracted, the PDF structure and the nature of the embedded URLs suggest potential for malicious JavaScript execution or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://olivier-daulte.com/ckfinder/userfiles/files/rifugenizoliwori.pdf In PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/64245286006.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/pavuviti.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/5657682835.pdfIn PDF document text
    • https://arendic.cl/files/luwawoxipabufagin.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/1533034258.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/58207261013.pdfIn PDF document text
    • http://dejede.com/userfiles/file/48839366365.pdfIn PDF document text
    • https://edusfera.pl/upload/file/serumutoba.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/42742903881.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/93077400198.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/kamijezelatafube.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/12049084251.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/sozef.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/56555797428.pdfIn PDF document text
    • http://fittbikese.hu/files/file/40673401623.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/25104067038.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/rimujesun.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/sosupata.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/zigomexejix.pdfIn PDF document text
    • http://aimic.com/userfiles/file/96249327658.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/0a1c052e0873051911d606e925bab7c3/povamefiwodevurufu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=gta+vice+city+apk+free+download+for+pc+windows+10PDF 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_off0000e452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE452 17804 bytes
SHA-256: 50dbfd29d339dacfe01a1e30562a6e52503647f67aff34d4eecefe41476a869a
font_01_sfnt_off0001123a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A51 11184 bytes
SHA-256: cfb310481221c6fed6c90ed4a821953e4a1baba2a2217232317209318b6ecbd7

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