Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce178ca80b3e24b4…

MALICIOUS

PDF

78.6 KB Created: 2021-09-17 20:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6bdff58adf416454a8c7949aead658d3 SHA-1: e158b9cef9f0c566706c8ed534f19e4eb9e9a09a SHA-256: ce178ca80b3e24b415b21e5368cfed524d517a303e9b9827dea8fee5ea20c8f8
174 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of external URIs and a 'download button' lure suggests the document is designed to trick users into downloading further malicious content. The heuristic 'SE_LOLBIN_RUN_COMMAND' indicates the document may attempt to execute commands, potentially leveraging embedded scripts or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://arabadvertise.com/userfiles/files/4100391950.pdf In PDF document text
    • https://projekt-lesen.de/userfiles/file/wukirofoxosora.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/lilovafatewut.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/52915774997.pdfIn PDF document text
    • http://yibetter.com/data/files/nesefaruvifozotuxarexokol.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3a2535392---sezedobikolivuded.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/47779373850.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/tenukerukekudasepumepubo.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/53684606703.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/lenejixim.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/48493095514.pdfIn PDF document text
    • http://qdcmd.com/data/files/zivefipi.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/96671201441.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/be1fa3.pdfIn macro / runtime command snippet
    • https://xyoaa.org/sites/default/files/files/xofesusimolinekomoze.pdfIn macro / runtime command snippet
    • https://clicksnepal.grnca.org/img/files/files/22770991306.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/nagomupexakewekesasafufaw.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/20016304086.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/86758127304.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/84438920106.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cee0d37186---80831171559.pdfIn PDF document text
    • http://artpolinakuzina.ru/piIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=celine+dion+mp4+downloadPDF 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_off0000c98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A0 19912 bytes
SHA-256: 39a5995af382ddfb0faef1e64d333770afd8607d18b0ba241000084f9c5d7ee2
font_02_sfnt_off00011592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11592 10384 bytes
SHA-256: 0112a563e7d0150e089cca3255488322f7fa1c69e409c3caf798eef75b9ec89e