Malicious PDF — malware analysis report

Static analysis result for SHA-256 de2047da46375f69…

MALICIOUS

PDF

72.0 KB Created: 2021-09-25 09:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ab9c923824eec7807f0a707c69c06596 SHA-1: 72940a515fab05b35efd1ef995f3cbb3a497b708 SHA-256: de2047da46375f697a34fcb5483b0c09e17db89fc4f3393569a07a8b8509351e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to form a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://www.findvoters.com/userfiles/file/91003477340.pdf In PDF document text
    • http://pttaccounting.com/userfiles/files/40049990111.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/41095758513.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/fitezadidelaxojilakuboxem.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/dudiketemudaselud.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355fe11e346---27010244524.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/xowowivoper.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210907_7C46C02014B2126A.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/76597804820.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/fiserekimotawupo.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/kitojusatubowujotibi.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/feleva.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/wewipezeras.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/sekujadifamawovo.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/kizoz.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/sujuxelukegu.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/44233967915.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/zerawuraresoma.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/69525421846.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/296183305.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/ketujozakedunuvagiwuzad.pdfIn PDF document text
    • http://benetalent.com/upload/files/27976563713.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/95736971667.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/kevavogekeligages.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/jukaketikotitapegusuxes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=play+store+free+download+for+pc+windows+7+ultimate+64+bitPDF 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_off0000b395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB395 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA7 16312 bytes
SHA-256: 49036c98d4f8346a1870747989a1d4ecc01f3d166650a3e5575b54f9f9c762c1
font_02_sfnt_off0000f487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF487 11520 bytes
SHA-256: 77e8f61bfd35619935752e62a11e57e10fcf843a195401c80f3eeb132e78cf68