Malicious PDF — malware analysis report

Static analysis result for SHA-256 e00c0dd5961f8ea7…

MALICIOUS

PDF

72.9 KB Created: 2021-09-27 12:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fffcdd73fcead447e8c1881f73c6f52a SHA-1: cec86ead2929e70fccd3529ebfe9b89c1f41839c SHA-256: e00c0dd5961f8ea7bc1e1765df44cb5b9e9946d576ce59603401a4924ea62042
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct hosts, with one URL explicitly identified as a disposable link farm. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://1carl.com/userfiles/file/40612355638.pdf In PDF document text
    • https://verticala.ro/images/userfiles/godonu.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-15/20210915143201981286.pdfIn PDF document text
    • http://yljczl.com/uploadfile/20210924100155183.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/dozekiraluno.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/56666810345.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/98338671064.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/10400774312.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/fuxugamusojovowukaseves.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/37540803315.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/4389297114.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/javixasanumapa.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/jigafopogake.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/gufazirar.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/tovezapoluwe.pdfIn PDF document text
    • http://klaaswester.nl/img/file/wuniwawokevekuweso.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/66128975685.pdfIn PDF document text
    • https://franchisevisions.com/broker-site/files/files/22225536162.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3b9ae45a0---21252111079.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/32847333560.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/26851931610.pdfIn PDF document text
    • http://fitviewer.de/files/file/9691900234.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/guvawesojiruxabaxaluwo.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/rixobon.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/29077020182.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+make+the+sd+card+the+default+storagePDF link annotation
    • 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_off0000b894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB894 10996 bytes
SHA-256: e35406faaf21dea5f3ebce03208016d8f1e181a6a5042f8cd8d6c5fbc454d3ba
font_01_sfnt_off0000d1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FA 17016 bytes
SHA-256: 29e41f41183390e2c78034408812981ec2ae90b3333dbb742e8a0515b4e09c5a
font_02_sfnt_off0000fda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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