Malicious PDF — malware analysis report

Static analysis result for SHA-256 e47a77e1af89e203…

MALICIOUS

PDF

82.5 KB Created: 2021-09-12 09:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 372779e65c4f82968318c5be230cff48 SHA-1: 0cf97d77e3033ba9dc0fbc2ad84e5ec749c6b507 SHA-256: e47a77e1af89e203e6cee54c73890ad2f7da7b023ca79e5b0fdba8385fc3cfcf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous embedded URLs pointing to various domains, many of which are identified as part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to disguise malicious links. While no scripts were extracted, the presence of multiple unknown URLs suggests an attempt to redirect the user to a malicious site for further exploitation or download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://registermycompany.in/admin/userfiles/file/94815009913.pdf In PDF document text
    • http://abwwilson.com/uploads/files/wokasal.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/tifirabiwikomogewug.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/dokezodufakipojezudoxu.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/wifokerenud.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/sufowamarigugekibekik.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/bibimitotajugawimagimaro.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/45818297694.pdfIn PDF document text
    • http://hybsch.it/upload/file/8275800458.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/pusoxuv.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe12769b95---gofigeziwewazuzax.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/38752718686.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/jufilodenoravedowo.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/37463577835.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/11625143451.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/rutobine.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/97345797210.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/54996840111.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/88282359117.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/57241434004.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210911084625.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/92970386424.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/de99e203414d48f81be140f563a6a18e/bomijifijimujomuwozapovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=direct+download+apps+for+androidPDF 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_off0000db7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7A 18568 bytes
SHA-256: 734982ae0914b9d14b19cf26da8668286489580a27da4009805946ed491947d8
font_01_sfnt_off00010b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4F 10700 bytes
SHA-256: 994c0d3108d6c16d83dce00ee1e9a1a1845ae8858d3def4900b4b2ef96b1f3ad
font_02_sfnt_off00012411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12411 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1