Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b9239bd65f12f3…

MALICIOUS

PDF

75.2 KB Created: 2021-09-17 16:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 45da94bdea611973246bdccd657b493e SHA-1: 25ff3deffdf7f8b07f261642575eb77551602548 SHA-256: 28b9239bd65f12f375249ff8a2e001ad6431238fc435496f6c446fa779c9797f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, with heuristics indicating it's a link farm on disposable hosting. The embedded URLs point to various PDFs hosted on suspicious domains, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

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 http://greenglobepms.com/uploads/wurupedaxawulebe.pdf In PDF document text
    • http://ei-windykacja.pl/upload/file/63443980870.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/lamubadewevino.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/gupewakenaduwan.pdfIn PDF document text
    • http://sudeoksa.net/userfiles/file/20210902165607.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/48381028325.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/22188955671.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/ratodiba.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/71875063574.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/bd15cd6a12afd51f59fd8fd83579704b.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/76675761686.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/88667819377.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/jebakaziverotowagasenafuv.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/zigowadejinowojovugetiri.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/dkk60qt91o9h946ge7nvm29m5h/54121008083.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/wolonenenikepoxekegota.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/bubekox.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/56409772197.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/kirevovifanolo.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/24565092523.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/naxos.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/86001676110.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/93720679736.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/5dad674876179c660e45d4a0c462c13e/nasuvinikapifawiped.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/25104885027.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/vibamasujiwejibujaguvumo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=lost+my+device+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_off0000c3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D6 10624 bytes
SHA-256: 1fb961c03f7a02d28e756ff54cf2ac18740cb4f83be98cb01fd6c5b09e7f02a5
font_01_sfnt_off0000dc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC26 16780 bytes
SHA-256: c23bd93dd4e5a7ec71529d16198d692536d94c2e262b10f88aaa82b2a4c2d0e6
font_02_sfnt_off000106ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1