Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ab00fa7cd248149…

MALICIOUS

PDF

73.4 KB Created: 2021-10-14 10:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 01efba6970f9563cc105c4c2d3279521 SHA-1: b8691d01473f238c33d89350a341d9464351e1a4 SHA-256: 8ab00fa7cd248149d71a545ac4e279a3e3328550b42db32e455011862afa83e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are structured as link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://wastran.ru/uplcv?utm_term=how+much+interest+on+unsubsidized+loan PDF link annotation
    • http://bukharajohnscreek.com/sites/default/files/file/gubej.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/23a2704358df17a0f724fb6baf79d39b/21753584227.pdfIn PDF document text
    • http://jawarakreasi.com/file/31933541626.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/takipunopipabikibixit.pdfIn PDF document text
    • http://channelletterguide.com/ckfinder/userfiles/files/4378435448.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/xarur.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/mofor.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/wuketitinejifidaviv.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210916_5ABB075C933C5D75.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/43499373661.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/jabikerofulijoxed.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/64080828606.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/puliputotubisinikenojef.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/43712344906.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/b2e2447f43ff09a9b6d1a14283367bab.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/zegalepiwexonowusitofo.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/gikegutujevudakosawikib.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/10702153317.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/57362062536.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/196e26b2513bc64e453eb0d0e0fbff9f/sirazilopijofeluduved.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/41211344142.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/46731543096.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/88198332676.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/midumufapabefidebal.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/kixipap.pdfIn PDF document text
    • http://dajia1.com/upfiles/editor/files/29273540172.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/82541904132.pdfIn PDF document text
    • http://slsnn.ru/content/file/dimegadowijekeganujuxival.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_off0000bd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD70 15832 bytes
SHA-256: 11dce4f0947844b529b8dd3907917de40af5dbb6dd0b926247f87365915de170
font_01_sfnt_off0000e5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FA 11012 bytes
SHA-256: fb491b7e3b5308ca8cbbc2d487d2bdd6272ee95eb44eb5ec4398cccb7de70ca5
font_02_sfnt_off0000ff6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1