Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fcc560b12705466…

MALICIOUS

PDF

72.4 KB Created: 2021-10-01 06:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8a66bed586c3634ec441becc316ab0e1 SHA-1: 44ce033c7e7172cd8de9bcb6614d472c101d6a24 SHA-256: 5fcc560b12705466209de1fdfbd33dec7b79c71326d90aad628f3155b073880f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, and one heuristic identified it as a link farm. While no scripts were explicitly extracted, the presence of embedded URLs and the link farm heuristic suggest the PDF is used to redirect users to potentially malicious content or further download stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/1075899138.pdf In PDF document text
    • http://jrpst.pl/userfiles/file/xesovizi.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/mur836ea7i4crqh6dp7cv6t9ct/40719669855.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/48596381211.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/94505511052.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/tunusedalimasoda.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/giliwaguzedefozuduva.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/tokuw.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/misubigopawikewebukajiz.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/49320754738.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/4014291412.pdfIn PDF document text
    • http://zerosquareonline.com/file/81209758200.pdfIn PDF document text
    • https://www.vconsole.com/ckfinder/files/35144887811.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/41684917768.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/zufowifovokero.pdfIn PDF document text
    • http://elskenecologie.nl/files/degekazikugokinapa.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/xazogibirupititamemibum.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/35519837320.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109110630553415.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/81690746134.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/8479254383.pdfIn PDF document text
    • http://cheapstandard.com/uploads/files/69217772732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=creepy+nights+at+freddy%27s+free+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_off0000b31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31B 18076 bytes
SHA-256: 9b34f51133072d42ae13da7d069628deca415549f4a58577097db2444400e977
font_01_sfnt_off0000e1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EB 11044 bytes
SHA-256: a76b2971a7d23ea789d145123ff4dc1199203044a03a55135751dda3e35dc6fa