Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b490898d4d39ed…

MALICIOUS

PDF

72.4 KB Created: 2021-09-28 10:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5e9219e16932e0d0602a0995610e16e4 SHA-1: d227d08aa15a0886f8625792a171f8570a12e6d2 SHA-256: c7b490898d4d39ed09615502a90af809079b3d764043982cb08c6fec010d87f7
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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 http://al-bandak.com/userfiles/file/piniluletudugifesagijon.pdf In PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74438073079.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/najimapusasokoxane.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/40053030578.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/25198938542.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/96090548769.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/pibumufetijupazuxewuzi.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614d854e5cf1d---fixumoru.pdfIn PDF document text
    • https://cargotavio.ru/files/file/9245774831.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/26266490907.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/rokolazi.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/dilosetapitorur.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/rizez.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/jurazulirowa.pdfIn PDF document text
    • http://15881588.com/ckupload/files/rizojiwizalulesitewigoz.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/wafakutule.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/vokamotogez.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/2388388994.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/mokipejufaris.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/83340592578.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/87378002446.pdfIn PDF document text
    • http://debten.net/UserFiles/File/relukevimirigazalafivex.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/99983504820.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f852d6323c---nolagepikutavu.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/67900997973.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/buwotugajisawetenudavom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=btd+battles+infinite+money+modPDF 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_off0000b642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB642 16884 bytes
SHA-256: a6984a5d0a0d296b28c4cef52e7199ed8cfd2cb68d5fd4507c96b25c2c17e965
font_01_sfnt_off0000e11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF936 10724 bytes
SHA-256: 5d90c824a53caae573034af1bae0b4d9ae23e29325b7b6d3ad0bd9eb38483502