Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f9a519e35ec0dee…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 01:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 529ebecb5cc1b8211affd84813101bbe SHA-1: 3852b5c1f10297929f2ef223a6e470c4c6bb250a SHA-256: 2f9a519e35ec0deea64e30e72dbf4491f5745aa0e1ec76c9229e6f8f14539191
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://drafthe.ru/uplcv?utm_term=credit+card+generator+with+zip+code+2020 PDF link annotation
    • http://pastadimatteo.com/ckfinder/userfiles/files/89114615911.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161401fcbd8e6b---sodosavinazekibanukutidu.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/guzut.pdfIn PDF document text
    • https://luminex.pl/upload/file/62908872437.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/8189630213.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/83602084344.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/gesosafawuwusuteradisop.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/puwonexugumive.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/51548700610.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/89655678897.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/bdf485859fb6c303dfa49752d4e267f9/xeton.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/luwefubiwagiruj.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/zikobopin.pdfIn PDF document text
    • http://nineslash.com/user_file/file/xitilolaj.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/tinete.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/46913582980.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/87971112495.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/48283602357.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/78501833439.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/vuvapoleduxaw.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/vipirujoban.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/32810654407.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/53584689489.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/85061697055.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/75738364716.pdfIn PDF document text
    • 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_off0000d7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBE 18008 bytes
SHA-256: 6e99a4f877286f37a765683705716cfedeb49c3d0926a0bcc3e1f956be178dad
font_02_sfnt_off00011ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC5 10996 bytes
SHA-256: 2ab477a7d9bc09b2a0d75bc175d1ccf06f646ceb6a69bba623632874975deafd