Malicious PDF — malware analysis report

Static analysis result for SHA-256 899df007f15c109c…

MALICIOUS

PDF

80.6 KB Created: 2021-09-19 08:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ccb6609648c2888511c9ace26796a5a9 SHA-1: 886bffa026beb3fb14339f586121ec9c937f8709 SHA-256: 899df007f15c109c8832923ec26e2b1af63f4bbfb1753b94a5278f9dc19be7bf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to various PDF files hosted on different domains, suggesting a link farm or a phishing operation. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high number of distinct hosts and links, reinforcing the malicious intent of manipulating search engine results or distributing further malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://guowangcable.com/d/files/53310813887.pdf In PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/purojovipusatixoboselok.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/dodokamovekopisigigemisem.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/nepiputajizixu.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/paburaruviw.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/bowejibugegomabor.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/vewofiwu.pdfIn PDF document text
    • http://lawngo.net/fckfiles/86295833659.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/98839838022.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1630760294.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/puzumaxaxemoruru.pdfIn PDF document text
    • https://onthespothousing.com/userfiles/file/fokaxitanaw.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/13574162782.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/raxixinogatelugadesenuku.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/85273981955.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/radujubib.pdfIn PDF document text
    • http://special-pharma.com/upload/files/25684460470.pdfIn PDF document text
    • http://cabini.it/userfiles/files/zotifalemozulemesex.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/xavoka.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/28393131003.pdfIn PDF document text
    • https://paperland.bg/uploads/file/3945386117.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/94418315085.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/fukazajuramakibezikizexo.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/70523354059.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=move+apps+phone+to+sd+card+apkPDF 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_off0000d588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD588 10624 bytes
SHA-256: 39be66efee7e4e19ff488dc1f71affecd89ca9fec827b84f694a67d66eb9c391
font_01_sfnt_off0000eddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EF 18132 bytes
SHA-256: 2ba8086cbb528e9ef2066400cb42bf8997a00397afda864010ed605b68ee0b6e

Open this report in the interactive analyzer, or submit your own file for analysis.