Malicious PDF — malware analysis report

Static analysis result for SHA-256 8156cab8feab9230…

MALICIOUS

PDF

68.6 KB Created: 2021-10-01 17:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: eb6c56badcd5de4712c3a8131338b6af SHA-1: cdbd7813b1debc61746e0f3ad1a7f4389b116d25 SHA-256: 8156cab8feab92308b9b2c9eb197fae8ef7161d35518e274258def55a98b9e7b
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristics reveal a link farm structure with numerous links to disposable hosting, suggesting an attempt to distribute malicious content. The presence of external URIs and embedded URLs further supports the attack pattern of luring users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://kalmi.ru/upfiles/files/fadozufunusoxezidilijafa.pdf In PDF document text
    • http://studiocinti.eu/userfiles/files/53464127752.pdfIn PDF document text
    • http://skolky.info/foto/images/file/2556530495.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/lojixatera.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/43833900998.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tonujuvobasarupitosu.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/60147903751.pdfIn PDF document text
    • https://preciseenergygroup.com/media/80858327115.pdfIn PDF document text
    • http://metallpress.info/files/88630883102.pdfIn PDF document text
    • https://kaparatt.com/images/File/gavaz.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/fepab.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/kborstppla44stjdjh9ensn785/37538205668.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/bebefikupuv.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/84355605080.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/52764038405.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/21091516555182792235vgx.pdfIn PDF document text
    • http://chanassociation.org/uploads/file/dotetuwipimoxadiluzit.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/ziratuxaw.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/42600152691.pdfIn PDF document text
    • http://grupophi.es/uploads/files/vabazatomot.pdfIn PDF document text
    • https://destockbaby.com/ckfinder/userfiles/files/94663877121.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-10-1/20211001041241316719.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/94051657436.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/vipupobogutiwosiwaso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=wrestling+2k18+apk+downloadPDF 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_off0000ae99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AB 14524 bytes
SHA-256: 93f839d248d58c7681ee222a89e2144f90e985fc496b050cb3657455d08bea4b
font_02_sfnt_off0000eb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2F 11120 bytes
SHA-256: f3fc92322e00f937377bba8b5da22aef7bcb5effba81acec299dc2d19a879131

Open this report in the interactive analyzer, or submit your own file for analysis.