Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e3806ad5cec7241…

MALICIOUS

PDF

75.7 KB Created: 2021-10-07 16:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 7e8d4d779615d0e21d3ee1a4dd589b1f SHA-1: 0d1e8f55e253ba2774f9636dbb25c9e2c040f9a2 SHA-256: 9e3806ad5cec72419fc5191ea84ecff3e87d496bfe8140b38af4adfad476347c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing lure. The PDF's structure and embedded content are consistent with attempts to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://jumpstart.mobi/ckfinder/userfiles/files/73962802242.pdf In PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/15671804373.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/49360383955.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/39564962012.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210922043053_2l9ysn.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/58941503099.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/kuvaretunizagug.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/nazaboxuzibokapizefexiw.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/37184230397.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/28843813608.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/23034628658.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/1991950775614e4fe9405c8.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/20459400567.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/fiparegoriligazeramasale.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/kiwopowifupatogiteb.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158ab7b70e63---95404310129.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/livifotegus.pdfIn PDF document text
    • http://congtrinhxanh.vn/media/images/upload/files/nerigawuvawesamudodevu.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/48c7fde71fc6d9a0da28e0fef37abe4c/69832580379.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/41165782440.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/sexixal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=solve+two+equations+with+two+unknownsPDF 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_off0000c13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC13E 10668 bytes
SHA-256: 22d0dfb9bba63b1bccd8b747b02b2ad69f0cd7a335d6ff1c51495031f986f356
font_01_sfnt_off0000d9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BD 18176 bytes
SHA-256: adf83a40e66b40891f02cbde86de4eb53c5569d53689affb27da7453badb674d

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