Malicious PDF — malware analysis report

Static analysis result for SHA-256 d03e168e6b6dec57…

MALICIOUS

PDF

72.3 KB Created: 2021-09-25 15:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cf7f81bcc33c5c530a61bbc8319f5b3a SHA-1: 16cc2c77879debca242fe557b38dd7a5cf863599 SHA-256: d03e168e6b6dec5722c5284fe3f053b7e4e13fbce92b1188ac9bcedcb7cf5170
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for SEO poisoning or distributing further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect 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://barrospizzadb.com/uploads/files/kudulunolaxa.pdf In PDF document text
    • https://festival.bg/fckeditorfiles/file/pulivozugowax.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/18740597954.pdfIn PDF document text
    • https://theurbanthinktank.com/files/20091146338.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/vakenurewoxoxuriluvinawu.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/62285320436.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/denimixonivapezajaw.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/31409701748.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/67681017391.pdfIn PDF document text
    • http://trivio.it/userfiles/files/lurefumejivanirabojovapu.pdfIn PDF document text
    • http://hocomesun.com/upload/72813294713.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/kapuvuvavobasak.pdfIn PDF document text
    • https://digireg.cz/upload/vikokogedazuvig.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/19828388259.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/zujatu.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/davarinegepad.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/fitelujexaxapaxupavo.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/finawulasagusu.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c8d2783ca7---13036690432.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/jcheveo5lbgs8m3sickspjh434/56723311255.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/morobupotusokewumixe.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/39075689328.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/vumuxibubut.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/votodogopoponikekejevure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=super+cow+for+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_off0000b147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB147 10560 bytes
SHA-256: 3d8a94f11197a293e55b8f7faf17dd72fb6aa0f7baa5eb10f5b97f014ee599df
font_01_sfnt_off0000c982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC982 19140 bytes
SHA-256: f1aaa565eecbc78c926b4c2f71e099b3a58a32e47b8a569ef029f16dc683918b
font_02_sfnt_off0000fa4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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