Malicious PDF — malware analysis report

Static analysis result for SHA-256 797237ad68302ffb…

MALICIOUS

PDF

69.1 KB Created: 2021-10-02 23:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cda22bec43c6d589e57edb5ed764829e SHA-1: 8ac9763636ec80a56a5cef1728a14156ba68368f SHA-256: 797237ad68302ffb40213c53829cd72902d3db4d783d10cc436008bab054f161
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including a link farm, suggests a tactic to distribute further malicious content or manipulate search engine results. While no scripts were directly extracted, the PDF structure and heuristic firings point towards a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://lblussana.it/images/file/wuwetabutozuzenur.pdf In PDF document text
    • http://pozitron-s.ru/userfiles/file/59294768193.pdfIn PDF document text
    • https://capitolmodels.tuzonanet.net/userfiles/file/41603423981.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/6363687887.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/85737870281.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/wojuguz.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/lekij.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/tivodikimujidijig.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/puvadi.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/90505536024.pdfIn PDF document text
    • https://henuopack.com/d/files/wozologevetop.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/89106979767.pdfIn PDF document text
    • http://seamacros.com/upload/file/wizubibopetid.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/47327884496.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/73547819223.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/17882052063.pdfIn PDF document text
    • http://timebymtm.com/upload/files/8331801197.pdfIn PDF document text
    • https://thehouseproduction.net/file/45877793296.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/71615868644.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f8ee8b5237---wevajikujanexagozake.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/99326079237.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/c56888759fb396977c5331fe13d259f6/86306783334.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=plead+with+youPDF 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_off0000b0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F2 15392 bytes
SHA-256: 247f950eb96c1a501285c6a8198187f8b8d0758279ece80a87b474cab8888c88
font_02_sfnt_off0000efbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBD 10276 bytes
SHA-256: 47a2435677639466a9257b57233374135e7620ca20916efab88efd134a5efde3