Malicious PDF — malware analysis report

Static analysis result for SHA-256 321a330b9ee794a0…

MALICIOUS

PDF

70.6 KB Created: 2021-09-20 12:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 13c4abcb28bd8b254837b5a07cb3bb26 SHA-1: 23a5e346c3aa27ce7fe125b5973e18fcbb9f9db9 SHA-256: 321a330b9ee794a0e6cab0a0f3099d055a6a32398fa940e6e90163a8220b07a2
126 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs pointing to various domains, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the nature of the PDF and the presence of external links suggest it is likely used to redirect users to malicious content or phishing sites, potentially exploiting PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://franchiseharbor.com/files/files/sebaniwetetatudexifapun.pdf In PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/97127088687.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/73008293810.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/denudiwosivinevaget.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/widijofesewadal.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/sunosijeb.pdfIn PDF document text
    • http://hydrem.ru/images/file/dogapite.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/25327978384.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/76945188804.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/kogelibafegep.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/varulevejawipizemuje.pdfIn PDF document text
    • http://lemma-studio.pl/userfiles/file/beson.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/defesuvukawesegeg.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/994308059.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/24329347716.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/gajida.pdfIn PDF document text
    • http://skupka23.ru/upload/m/13074901575.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/1eb36ef9420472b6b855ea28544cf223/77649619876.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/pabosojibemitugeguz.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/jewegobobokurufo.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/c23ba9d240d000785a1094c7db767309/56612526340.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/34545006229.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/jaxevizeselit.pdfIn PDF document text
    • https://htchninc.com/d/files/rimedevotosizenugujekix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=eye+protector+apkPDF 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_off0000b6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFE 15436 bytes
SHA-256: f02e8295550367f3de33708b78a66ce3ce2d64bec63423af01670b8445df4cd6
font_02_sfnt_off0000f603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF603 10148 bytes
SHA-256: 3af96da070ac90ed3de9cf0f8745dca40057f4b88c1dc3ed1100a4adab150d50