Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4192e91c73161d…

MALICIOUS

PDF

81.7 KB Created: 2021-09-11 19:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 82970c39598fc01d1c49c47687c123ce SHA-1: 7c502ff51f0bf7c53f02754b9c450eb2e375b1b2 SHA-256: 7b4192e91c73161d5e57aedfa1fc8b839da56d12810ccd8754b951c957deebb7
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1553.005 Security Software Installation

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm and attempts to lure users into disabling security software, which is a common tactic for phishing or malware delivery. While no scripts were extracted, the presence of numerous external URLs and the instruction to disable security software strongly suggest it is designed to facilitate the download and execution of further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://nomylo.ru/uplcv?utm_term=find+data+saver PDF link annotation
    • https://actorconseil.com/files/file/xutunumotif.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/pabojezuwaborefonire.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613726523704e---bebixawolilevotovu.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/winodazubemuwoduzebi.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/maxuladure.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613002e7d89ff---52833051298.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/99353317340.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/vexafufin.pdfIn PDF document text
    • http://baove247.org/upload/files/kezokixoxoz.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/tajiku.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/53847603303.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/bazizaxegaxovitugowumuv.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/79822038569.pdfIn PDF document text
    • https://biodez.lt/i/File/81294852452.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/34861078556.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/3164374472.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/zemobomolekotadudewugavi.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/zibovaso.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa7c87674e---safojiguzoze.pdfIn PDF document text
    • https://paradigma.bg/uf/file/13221517863.pdfIn PDF document text
    • http://demkapi.com/resimler/files/58638541543.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210907_CCAA15D80BC9683B.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/54933785645.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-11/20210911010504520031.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/lisewijuwidotizari.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/sorigemulifaraboxaxituzu.pdfIn PDF document text
    • 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_off0000dabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D6 10120 bytes
SHA-256: 169e946eeedb41d5b85ed2f1a7e2d1f8f91a4d103982d4c62324d00012e70934
font_02_sfnt_off00010989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10989 18492 bytes
SHA-256: 3195e1735f86c57d95f1854dc245f5ca47caa948b3de0a7c06183dbbff1e7dbb

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