Malicious PDF — malware analysis report

Static analysis result for SHA-256 2decfec06e564d55…

MALICIOUS

PDF

89.6 KB Created: 2021-10-07 05:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3e47fe9286165493e323dc40a62d4f82 SHA-1: 2a6f3a102625ba2d2e91e63d9f5edf1df4e54a49 SHA-256: 2decfec06e564d558b8e25a7d0d333c27257abc0b84e7e82695fca0ca616148c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and external link behavior are consistent with common phishing techniques.

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 https://marblo.marblobaths.ph/app/webroot/img/files/luresunoxogu.pdf In PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/14628733189.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21128290303.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/xodazelonaresixabowunum.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/5783521698.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/6119230479.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021917185137170.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/70842419663.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/zawulepejopigofe.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/78421714320.pdfIn PDF document text
    • http://tano-cable.com/d/files/tajumefepaporonivajogoj.pdfIn PDF document text
    • http://infoguard.ru/content/file/77405208337.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/banofemalaluwudadulekobuk.pdfIn PDF document text
    • https://hoppe.dk/files/9561242567.pdfIn PDF document text
    • http://bushurov.ru/images/files/51220320092.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1632654767.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/jawulipexumojajujolaz.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/98411581689.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/ranibuwujosuto.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/musufeziminibusuzebin.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16155e973a6e45---5001918820.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/gebutijodivizisu.pdfIn PDF document text
    • https://dptech.vn/uploads/files/40404776814.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/50983121574.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=yesterday+movie+watch+freePDF 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_off0000f7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEE 10840 bytes
SHA-256: 02319f55453f2953dc37b2d1f825ebfb4644f6e36a3fcdc881c57bab86a49453
font_02_sfnt_off00012912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12912 18244 bytes
SHA-256: a2111ddfae3eabbfa521e8999d1657ac9e11e5d8de45dee28ab98d5da2639ddc