Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a3ca59705ecf79d…

MALICIOUS

PDF

80.5 KB Created: 2021-09-23 14:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 30dea2cc3fa5c53119325d8feedac17f SHA-1: 3c80506f51fe1f61ccdb6faaf9a9e55a7ec0d7d1 SHA-256: 1a3ca59705ecf79ddc443dd11d10cd27d74e330b799a6964d9b10a90cb20884d
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document's content likely instructs the user to install or connect to a remote support tool. This, combined with the numerous unknown URLs pointing to PDF files, suggests a phishing or social engineering attack aiming to trick the user into compromising their system.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://bhiringisamsankalimandir.org/ckfinder/userfiles/files/liratulosujeti.pdf In PDF document text
    • http://husplaza.hu/editor_up/rafakilaninujenorikim.pdfIn PDF document text
    • https://magerp.org/upload/files/19853298719.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/sikarutagixebunupixevowef.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/3859547533.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/sijizilipejiluxuva.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tezokekakupovopusineran.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/82938266530.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/29415940954.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/86228048952.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/mazisotufosam.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/84751890415.pdfIn PDF document text
    • https://ottopianos.nl/files/mukuxatuve.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/80545084878.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/82481518054.pdfIn PDF document text
    • http://ruresept.ru/files/file/rurovopesekuzewigaganoji.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/2612134201.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/fabezofemumapubeletoz.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148c8d952a01---72608531663.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210911061219.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/16818149423.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/dukilup.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/81859838494.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/madelinavare.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/xabonebijasafarufe.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/59568545062.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=remote+ipad+from+androidPDF 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_off0000d4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EC 10492 bytes
SHA-256: 81e73dbc2d9a88ad60282af538f22079b92b58ff150fe61b41ecb10c5afbbdcc
font_01_sfnt_off0000ecb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB5 18344 bytes
SHA-256: e54c4398ed1f53336e069cca32f4eebd5a69d9073fececd35476bc2e882e1425
font_02_sfnt_off00011c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1