Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f7924af7ac7905c…

MALICIOUS

PDF

77.7 KB Created: 2021-09-08 14:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e2f3161f03a78deeeb48248ff915834a SHA-1: 86555acb820ef8c890ac3e6033ede11293f11d55 SHA-256: 6f7924af7ac7905c58248d9fcd03304be9eab1e6d9ea12909603a3d58364ac42
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external links, many pointing to disposable domains, suggests a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://tp-pos.com/uploads/image/files/lujekese.pdf In PDF document text
    • http://koddous.com/userfiles/file/wamejokurawopu.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/noveramibaj.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/32171478239.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/nujofudizo.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/20848591573.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/88118245646.pdfIn PDF document text
    • https://ccichn.vn/data/upload/file/vizikixejokurokiv.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/23273350026.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/18003982775.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/lifisipevinusufogogegolel.pdfIn PDF document text
    • http://mq-water.net/upload/bilagawilizodigo.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/65431117222.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0602777001630686047.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/sisejizik.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/90240358379.pdfIn PDF document text
    • https://webmenuplus.com/images/file/bulejugupobuzaginiwejavuj.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/xusorakazul.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/zudeb.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/goxirepunu.pdfIn PDF document text
    • https://tckontrola.hr/files/17024881360.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161377c048dc77---12159476000.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/13384197793.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/12231719103.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=lure+fish+house+menu+pdfPDF 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_off0000ce18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62A 17016 bytes
SHA-256: 6b84e6bd00d2d5da3fba8deba5c8254d3255055358c1afbaf39116da99478f61
font_02_sfnt_off00011200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11200 10512 bytes
SHA-256: 28b5b6d5b6b7561f9dfb675f9297865f503770683a13fa6b9a7c5062a36c59f6

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