Malicious PDF — malware analysis report

Static analysis result for SHA-256 83dde80a2a3d7150…

MALICIOUS

PDF

83.5 KB Created: 2021-09-24 03:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 29acc4a353257dd6da7825ae1002d741 SHA-1: 7e784a41c02691b25afc88445b68409cd22c918e SHA-256: 83dde80a2a3d7150df88f423410379b53a0d0e8ca0246d0e41dbebbce93632b3
174 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URLs, indicating it is designed to download and execute further malicious content. The heuristic 'SE_REMOTE_SUPPORT_LURE' strongly suggests the document's purpose is to trick the user into installing or running a remote support tool, which is a common tactic for delivering malware. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=screen+mirroring+android+ke+pc PDF link annotation
    • http://tattooindex.nl/images/uploads/xusajetafukijibetax.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/botixevedajutet.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/37866929739.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/detipizurogoropopek.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/mamixeb.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/25042325696.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/5e26f906c4a1c4ee91be90b5c122b19f/993253539.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/31208804028.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/23296657349.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/39320501389.pdfIn PDF document text
    • http://noithatmyhome.com/img/files/dikenojaranabolub.pdfIn PDF document text
    • http://bankerz.in/qpic/files/49259280611.pdfIn PDF document text
    • http://mousike.it/img_ins/files/59026564783.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210924_070516.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109081005284355.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16142790374cb7---33791232428.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/69922002745.pdfIn PDF document text
    • http://moneymaker-gold.de/files/27160925777.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/35591107951.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/54581366394.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/68202681760.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/wudajovufinuseme.pdfIn PDF document text
    • https://mkart.it/uploads/file/kawarikevokax.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/94109174451.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_off0000e1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D7 10712 bytes
SHA-256: b695ae78679d2af611c2fed1a528fc07390183c158d509a586e8b7b1536faaf5
font_02_sfnt_off0001122a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122A 17984 bytes
SHA-256: 6d97dfa36635f06b2590a1d13abc0166437cbdd1fb2a538f0396aa203ea6b11b