Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ddbd27b82e803c7…

MALICIOUS

PDF

87.0 KB Created: 2021-09-09 22:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: bd03788c870c4133ec0256df3b3a96aa SHA-1: 950ac676136518cc878958114852ee8b3d602d1b SHA-256: 3ddbd27b82e803c7d4b61dc3e773312ef80538aa310511e38ce4de9d0d018fa7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files on disposable domains, suggesting a link farm or SEO abuse tactic. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://angkalaris.com/contents/files/85946694023.pdf In PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/lazevawudi.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/wagowevuwobesusulu.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/papegunejikowinosirafiriv.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/92906366960.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/81869455462.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/31367765538.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/nopikivizugam.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/muxaromewobatabizuw.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/55080761512.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/33290283117.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/junox.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/11131858300.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/wefefivarebavawepowirosib.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/8964764022.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/11493892281.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/83982456968.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/38237364119.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/vilasakawomudepilam.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/71776254298.pdfIn PDF document text
    • http://showdoimovel.com/files/files/givotar.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/refewimixofamokumu.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/46845122728.pdfIn PDF document text
    • http://integrotech.com/zdjecia/file/62938222894.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/47070523430.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/56458112785.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=fast+and+furious+9+tamil+dubbed+movie+downloadPDF 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_off0000ed94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A6 17976 bytes
SHA-256: 6bda9784b893fc82eaf7b760e27f116c736f1902d70a6a953c3094157208171f
font_02_sfnt_off000133ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133ED 11052 bytes
SHA-256: fc98ba3480c0b8582a85a7ca024f50dbe017e133ccc4636744fef9e364a2fb89