Malicious PDF — malware analysis report

Static analysis result for SHA-256 c03ec8d99eb4412f…

MALICIOUS

PDF

79.2 KB Created: 2021-09-18 02:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 841ebb0b0e47d4ca46f56644f4bb4013 SHA-1: 14ced2d16bd15b5ccec9e8111ab2578180b6d61a SHA-256: c03ec8d99eb4412f9bd93a839bd7c5ffaaeb81c4398ca6aa1a21b5e99e3495fe
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external websites, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://smidgel.ru/uplcv?utm_term=android+music+transfer PDF link annotation
    • http://ruresept.ru/files/file/rukat.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/borixopuzutaruwezeni.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/32616435122.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/dalolofenunugepexi.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-8/20210908081713776564.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c82604bc3---4042913866.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/xerekupebizadonala.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/30169380694.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/57314315769.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/fc23b4dca19b39e75d33678a46a0bc84/gumuvogilurowuwusuwuvaji.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/14207375431.pdfIn PDF document text
    • http://dezis.ru/uploads/files/panan.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///sefugesoveposurokominede.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/34557278142.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210918060032.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/funobebimigiwikuko.pdfIn PDF document text
    • http://allycatering.com/userfiles/naromovogizeda.pdfIn PDF document text
    • https://matagujrischool.com/admin/imagetemp1/file/56138156900.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/26070705678.pdfIn PDF document text
    • http://landpas.pl/upload/file/7646247400.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66699609452.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/vesipaxiradukuxokezeperav.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/rimarid.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_off0000d18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A5 10672 bytes
SHA-256: 718e35051e2279ca08aa72501739d4996dce38d57df717a1bc62368874d18c8e
font_02_sfnt_off00010225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10225 17716 bytes
SHA-256: 2fc366954b981ab8895610181ee62284a714d1bad31f3bf4f43a533dd655d82c