Malicious PDF — malware analysis report

Static analysis result for SHA-256 00c139787a4eef49…

MALICIOUS

PDF

83.6 KB Created: 2021-09-24 11:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2508aa88d599b26320feb3fdc076ce05 SHA-1: 5a4362e9da600fc35b6681a24b569d76d81701fa SHA-256: 00c139787a4eef491580d9fcbcf123cff8f6d2c59d39e7c17002f36240bf9fa4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs, many of which are part of link farms on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates the document's primary function is to redirect users to external, potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=libertad+pasay+zip+code PDF link annotation
    • https://nacituran.com/userfiles/file/23820077521.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/xivodisolisaju.pdfIn PDF document text
    • https://luminex.pl/upload/file/laxutivoteniwikopelevixi.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/xibijemajofo.pdfIn PDF document text
    • http://emannsltd.com/userfiles/41783486652.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/kaxemujefajetepubinovus.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/didiwagogujo.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/60985493420.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/34013424326.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/46985689704.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/lukudivovikomukefe.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/lurizisaje.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/rodej.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/gulizuduleketejunawina.pdfIn PDF document text
    • http://thedreams.cz/files/54439485986.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/94934473933.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/72768565744.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/63176640705.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a8191e63918e12cf802878cf14b97289/tudolezagaxubaxirigavo.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/53560324194.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/buxozukubafojifitoxelolun.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/sororuborixukexutubefojad.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/selodemunujar.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/92124277764.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_off0000e1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BA 17836 bytes
SHA-256: d2c65b82030ac78c15ef72482eb26d3be373af45039b580c163a8de919c95c09
font_02_sfnt_off00012859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12859 10628 bytes
SHA-256: d111b62749707de8240a1314eee146e0c677244932ddf5e76b6c0cf159b49d65