Malicious PDF — malware analysis report

Static analysis result for SHA-256 73998bfb9bd1b614…

MALICIOUS

PDF

81.6 KB Created: 2021-09-16 06:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3b5929b1f3019ba7cf42e5b8319ceb4b SHA-1: 0bdc2b925ffaa7911b336f5a64b0b3126e0d8e99 SHA-256: 73998bfb9bd1b614197281b68cbc4d7957e88cb699a17bad0d59e4cf9b36232e
134 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous external URLs, suggesting it acts as a link farm or a lure to external malicious content. The presence of a 'download button' heuristic further supports the phishing or malware delivery intent. While no scripts were explicitly extracted, the PDF structure and URL findings strongly indicate a malicious intent to trick the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=convert+mp4+file+into+mp3 PDF link annotation
    • http://tubemakingmachine.com/uploadfile/files/medebofaxej.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/27218975608.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/43636837097.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/guduz.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/72698834052.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/xukuk.pdfIn PDF document text
    • http://dinhviht.com/images/newtech/files/kitaxipitumunojabijikesu.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/bipeti.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/wexapuli.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/30104227031.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/fenet.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/1999736092.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45558954679.pdfIn PDF document text
    • http://baoveantam.org/upload/files/66850181513.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/latezafizew.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/fadoziduzonaxal.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/b2vgsu8m189bd8p032lgtfpnk7/jomeziwojoravixutun.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/sunufon.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/nuzakakenutawelare.pdfIn PDF document text
    • https://intersat.lv/files/file/kegikovizinux.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/22932291137.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/kawowirevunosov.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_off0000dc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF413 17400 bytes
SHA-256: 87a3b25d0c6a59ab77c050912735a0523a540d9c44bd28ed6cc38acd51046796
font_02_sfnt_off000120da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DA 10536 bytes
SHA-256: 474951042824ed0924ece1f3e35db3cb17e7df556dd24144328de5add1c97740

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