Malicious PDF — malware analysis report

Static analysis result for SHA-256 2092404f9ccb3233…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 04:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2c4e2d2bb0ed646366a3e051b30f74e9 SHA-1: f41781d891df54b832f463e730de31386b855cc0 SHA-256: 2092404f9ccb3233a7f9e707257e26f9cfb33540e1b0fd1d81c56d853b5675ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links pointing to various domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=lte+only+android PDF link annotation
    • https://alwillislifecenter.org/ckfinder/userfiles/files/83536847854.pdfIn PDF document text
    • http://hevolta.com/upload/file/59242232915.pdfIn PDF document text
    • http://platcometals.com/images/file/2661771261.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/rowafanijefox.pdfIn PDF document text
    • http://tinhotsaigon.com/uploads/files/15505225587.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210902055101_7mwpzv.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/54876137120.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/97630335724.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c3cb9ee5e---zaledax.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109062008456215.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/wiwikigisiwitozato.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/felotep.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/wabesifotamasonob.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/6661669029.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/718545569.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/2277721330.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/79079175056.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16143291800a36---xejitiwuludoki.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/buxolobonaki.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/wijib.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/72015164551.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/vipesaf.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/visegedorelesajam.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210912_193145.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/tiguwuxujokifex.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_off0000d7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F4 10144 bytes
SHA-256: 4e08080ea099354ab0f3c57551c40492903edbdbc283da0c7ad2d9a3f705eba8
font_01_sfnt_off0000eeb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB8 18456 bytes
SHA-256: 0d947cd2e11755ed8f51b2da8248982e658d963df9bdb47ff5f4c7cc3346ec6b
font_02_sfnt_off00011ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1