Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd1916e428288959…

MALICIOUS

PDF

89.3 KB Created: 2021-09-14 10:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7b661fa9d4987e008dfd18dfe2764d3e SHA-1: 27829041ecef8d6057273e36c5a7e9f779f8dfa3 SHA-256: dd1916e428288959cdd26eb6ff3bfcab6c05ceae8ae51ed8f3a31d618419b4f4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, with numerous distinct hosts and disposable links, suggesting an attempt to distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 http://hondasushi.com/uploads/files/besudubomowumiwujokit.pdf In PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/68619817033.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/19363423372.pdfIn PDF document text
    • http://enewind.com/pliki/file/24326168688.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/revawedejajaberigos.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/latemubirusojexibi.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/7364951514.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354b41cf690---55948210270.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/kofunulipagedade.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210910_23D71523DC1B2558.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109101823472803.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/magunabagobovezubab.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/d06cb79e82107f14e6643b2d7d551b38/24403542525.pdfIn PDF document text
    • http://khocabien.com/uploads/files/49312779785.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210909221936_585655165.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/51363773741.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/pesulaferomodudabiser.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/gunuzinubaneladugulurev.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/88084133181.pdfIn PDF document text
    • https://paperland.bg/uploads/file/26885261108.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/3316288083.pdfIn PDF document text
    • http://somersetcountybar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/339443372.pdfIn PDF document text
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210905170301.pdfIn PDF document text
    • http://ubest.ru/images/file/joratazofeke.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/zazobokuvoguvara.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/86422715438.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=lost+world+michael+crichton+pdfPDF 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_off0000f712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF712 10928 bytes
SHA-256: 4d8d0df95f30cef15fa2b36fbd17751df3d8225d30bca0b0c65b4fe4c733eb8a
font_01_sfnt_off0001103e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12850 17864 bytes
SHA-256: 8ed86ec214304d094793755e7260ef33f137a4b4602c75665c3677c1a55c7991