Malicious PDF — malware analysis report

Static analysis result for SHA-256 4360b047f639f19a…

MALICIOUS

PDF

77.6 KB Created: 2021-09-17 04:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 10b9970455789c4c19b07de957c3273b SHA-1: ae6c92fefe3bf08b4a73ca03a64097f0b6b4cbda SHA-256: 4360b047f639f19a3883982afce6140e306f28a73602869d66e4040efd30ddf6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic point towards the exploitation of user interaction to redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=gta+san+andreas+1.0+apk PDF link annotation
    • http://eros-arena.com/eros/userfiles/file/golamarubulawizitiwawuzo.pdfIn PDF document text
    • https://kermanrooz.com/img/files/4262362885.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/tuxexevisovolu.pdfIn PDF document text
    • http://licausi.it/userfiles/files/95912659361.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/zixarezirevo.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/luzokojirugevinit.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/34100498864.pdfIn PDF document text
    • http://hrudolf.com/userfiles/56657694978.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/3581999264.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/87316433102.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/xuwelifozipovitodopazosi.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/rutomiginizow.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/koselimowo.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/31039058477.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/poporanujiwinuralobufasar.pdfIn PDF document text
    • https://sona3elkhair.com/userfiles/file/53800164875.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411eaebf76f---fofemetipuvoxi.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/laxiferezoxifej.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/bimoxodozuzuj.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/bepejolewofi.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/30860741573.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/86053234444.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134930bdab64---mosuruden.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/40938878330.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_off0000c2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2DD 20876 bytes
SHA-256: c0844004bce86c815838fbac6f5f015409c8eb1de98f01129474a4adf04a1cd5
font_01_sfnt_off0000f89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89D 10496 bytes
SHA-256: bc3796a27a44b0f8b7a50cb07a9b9cf2ce404257770722ba219ec7527c877018
font_02_sfnt_off000110b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1