Malicious PDF — malware analysis report

Static analysis result for SHA-256 686dbece990e2e46…

MALICIOUS

PDF

118.1 KB Created: 2021-09-08 14:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 84a0a70fdeec3efdb3f602f48e3e651c SHA-1: d2bd352b0b7de837f19d2631fe4006a8af9d6a67 SHA-256: 686dbece990e2e46eb53aa782a0745a122c3417dc5ca52ad63d2bf21a8203b0f
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to a link farm, suggesting a phishing or redirection scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF's purpose is to host many links on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://denda.co.kr/ckfinder/userfiles/files/28483812879.pdf In PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/radijatesinij.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/nadedigevoromoka.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/77264474030.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/41275788976.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/24483810020.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/dosevedabuvileriju.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/17820596040.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/polemika.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebf9873de5---zaxozamupepetawivisexi.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/towomukovirozinedipevun.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/temabovoviwa.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/70349848701.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/tunijanoratugabuzubuke.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/lupirunurigogowofil.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109071619354500.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/93940593894.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/dipanedaziraxetidemoz.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/78387341264.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161384ec912128---39476394512.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/83260188661.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/xiputeno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=evidentiary+value+of+dying+declaration+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_off0001696d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1696D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18184 10888 bytes
SHA-256: 24781bb2c754f4c9d62415d75bb31eef2dbd7d2017ce39ed15ed282dc1fd98ec
font_02_sfnt_off00019aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19AA1 18564 bytes
SHA-256: 9524b131eabe4b51ff05abc995a47cff377a525b95ced8bd63a13d94ffdbd857