Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f6d9a4ee8085a2…

MALICIOUS

PDF

82.4 KB Created: 2021-09-17 23:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 32478365ab948db794c7eac8cc1be528 SHA-1: e1776a00ac30de2718014c909eb7098351a68ae5 SHA-256: e1f6d9a4ee8085a2ad3264bee7366230e518a1b5f9fe175ace1bf1e554d161ac
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were extracted, the presence of many links suggests an attempt to direct users to potentially harmful content or for SEO manipulation. The authoring application 'wkhtmltopdf' is unusual for typical document lures, suggesting a programmatic generation for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://ghettaetamionarchitetti.it/userfiles/files/79219114098.pdf In PDF document text
    • https://navoloki.mebel18.com/uploads/files/xanimeseninugef.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/juxabalovefizowubanu.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/78644199812.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/firad.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/lagifuneg.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/favegawevitak.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/fizil.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/51744019683.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/xurinemuxodofatofabafow.pdfIn PDF document text
    • http://sung1.com/upload/files/56699784238.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210906135745.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/wuwejewo.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/pisanebatipe.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/tugeronotininojaduxede.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/xevakasiruvekegukugiv.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/8eaea90f26e6bdb4c7f5455b0113b4e6/15009446556.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/kuniwixad.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/42986593467.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612fabf95e2bf---tironuzepefep.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/83743509536.pdfIn PDF document text
    • http://atomleasing.ru/media/File/sazejasekikumeza.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/xukizelagukadinepi.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/42540583568.pdfIn PDF document text
    • http://4bx.pl/public/file/bofojerufel.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/fepomelivuti.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/giditukojidetuwukokemado.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/bapudilezemu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=stick+war+legacy+cheat+gemsPDF 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_off0000dc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF487 10820 bytes
SHA-256: 070db572c66dc20598aa56f912454577d473ed98b48849ea45be62913e0d3df9
font_02_sfnt_off00010d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8A 17680 bytes
SHA-256: e79a6c48b4ab1cccb0cf7270a5b9874a820c601cf8eda9bf80e99df08f7137e0