Malicious PDF — malware analysis report

Static analysis result for SHA-256 d99426d8800289c5…

MALICIOUS

PDF

89.8 KB Created: 2021-10-04 11:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: f81bafd3f29586d8758f4bf6caa07978 SHA-1: ba2178084a607b3f32eb6a77f860a1e2c5d32f24 SHA-256: d99426d8800289c5df7a8b00b6b8a94c1b483d6473ee91a89341bc54b5e42a58
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many pointing to disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external sites, which could be for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://pistant.ru/uplcv?utm_term=day+of+the+dead PDF link annotation
    • https://pragatitic.org/ckfinder/userfiles/files/zigituwatumikibadexi.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/88395497627.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/jukunogaloruroxu.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/5443991038.pdfIn PDF document text
    • http://exima.kr/userData/board/file/95077324608.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/12195105554.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/98569633705.pdfIn PDF document text
    • https://nusantarabet4d2.com/contents/files/tonogunugolupoxigedo.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef414816b9---piregokabosimivijedam.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/26165452224.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/74585759846.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/binisolexalizusuxab.pdfIn PDF document text
    • http://www.centralperdana.com/file/lunuperokuvof.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/1c782209b33bfc6b2697c8d07d8e42fa/38741520520.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/66144974875.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210914021839079.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/70500671198.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/34067973348.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/kafobikoxisopazigesun.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/depujesi.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/detawuzojus.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/wafuguzafafeludeparuwesag.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/foxewatonopejavulepate.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_off0000fcb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C8 10056 bytes
SHA-256: 5dba9648e02acc23cf17cad838806c8852ada016607a1d2bb9a0794ebf38006b
font_02_sfnt_off00012b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4D 18140 bytes
SHA-256: a090455bbcc8b244b189b623342feec27e6858cbe27cff89b9a0d1b141cf7a8a

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