Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca5f794c1f9c2a5…

MALICIOUS

PDF

73.2 KB Created: 2021-09-17 18:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 29b7f46985d444ef60ae1ce5848bec79 SHA-1: 709ddc699c36a926321bd96696bae245f3ebb64a SHA-256: 4ca5f794c1f9c2a5ef4d35a5bd5a8689267a15556cb32cba37fa7e9f652eedb3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, suggesting it functions as a link farm or a lure to external malicious content. The PDF structure and embedded URIs point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://sportcity.bg/webroot/img/content/files/31990480765.pdf In PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/hpd07m1nctv45k0qlj3utjjbla/29279277862.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/34957279486.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/rinifezomesumalaluxuxag.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/zaxitixututomuxasud.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/misiwuxarasava.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/relezalolufapemikiwopu.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/nipilenav.pdfIn PDF document text
    • http://mannadey.in/FCKeditor/file/23674215502.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/luvijapozadorusanibanosa.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/59777334236.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/52839634207.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/e424ba2ad8d7061b19ac9e278546ecba/73479736712.pdfIn PDF document text
    • http://dungculamdep.com/fckeditor_userfiles/file/55472723541.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/41419290819.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/vakaf.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/63620725632.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/saxuzerifiw.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/sifiti.pdfIn PDF document text
    • http://ghefootmassage.com/fckeditor_userfiles/file/venixixuzemutalomekezari.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/dojejomufawivelebi.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/81074311163.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/53677874824.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/zojuruvevonomibisopitur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=real+ghost+detector+camera+apk+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_off0000bacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBACB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E2 11092 bytes
SHA-256: 81879b489592609fb73b55a7e3b294bca3df7c55486f9b5d5c3c9e74c60c8686
font_02_sfnt_off0000ec77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC77 16612 bytes
SHA-256: 5c761cafa8c28e018a4b8c4ebe753feecf7a2fb027981fe57c8ec40ff6931e5c