Malicious PDF — malware analysis report

Static analysis result for SHA-256 76f1ac0daab83bd9…

MALICIOUS

PDF

83.1 KB Created: 2021-09-12 15:36:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a5d61688be0c53a3c4446a0bcb204909 SHA-1: 327b7d47687bc18bf20e80e4c1b3b6c342bcae7f SHA-256: 76f1ac0daab83bd963b6ff2fab6229e04a47243b5ca766bd90871eef9b7ffd2f
166 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains multiple external URIs and is flagged as a remote-support tool lure, indicating an attempt to trick the user into installing or connecting with potentially malicious software. The presence of numerous disposable links on distinct hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=conexion+remota+con+android PDF link annotation
    • https://mobilpetrol.olajpark.hu/files/files/72007306899.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/xotajutilufejusex.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/6209747599.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/36191019248.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/27223734423.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/tuxotogapurajavabimux.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/74602105441.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/tisubuzujerajenawopaka.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/ruvowowazovajum.pdfIn PDF document text
    • http://ropesadventure.com/d/files/28669295774.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/2549ef7dbe1f6f4a808ba90099854df0/88493314847.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210910060508.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/lilikigutajuwutifupinajez.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/pejivemorarutaji.pdfIn PDF document text
    • http://batistar.fr/userfiles/file/xudofe.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328234c6593---1166660485.pdfIn PDF document text
    • https://theipbuzz.com/images/file/23716697450.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/zujatubusufofipugumanuwa.pdfIn PDF document text
    • https://paradigma.bg/uf/file/tipumopiludune.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/lulekunijojesufufirumapob.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/48323840687.pdfIn PDF document text
    • http://lovesenergy.com/file/19691521509.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/kedudutonevarulexipazize.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1630940859.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/xoxefobuduxigataw.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_off0000deda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F1 10452 bytes
SHA-256: bdc1455cbd2dc6aad8cdf52f8f2b8777a78200081d40d49aa8ee136825b887f4
font_02_sfnt_off00010eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB0 19044 bytes
SHA-256: 39d1c9090e427e45a62c1fb6c3ff371476928509b15b91475243afff0f2e0832