Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fddfed1a818bc8e…

MALICIOUS

PDF

70.1 KB Created: 2021-09-27 09:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 715c614d2362cb5d3e26c5e0e580de83 SHA-1: 8a2a6d33eecad0299370016f284832189dea1c85 SHA-256: 4fddfed1a818bc8ec45d7bd99179152f470ac0d378fe808a064fbd204643fbbf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous embedded URLs, many pointing to unknown domains, suggest this document is designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://dade666.com/userfiles/202109file/2021091712015670554.pdf In PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614eb5978a955---65970197786.pdfIn PDF document text
    • http://dsagco.com/Upload/file/33078896208.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/7138082760.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/28590998266.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/94916885106.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/54220343562.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/35977859606.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/ketaluzujekexepukilab.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/komuwirigojolixesemaf.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/8828608644.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/46689267033.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614f13716ac89---29987686679.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/rumomexakuxojezifosowu.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/towotivosafa.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109011105159765.pdfIn PDF document text
    • http://advertisingreports.info/assets/ckfinder/core/connector/php/uploads/files/19279255431.pdfIn PDF document text
    • http://capableapp.com/uploads/files/69740802864.pdfIn PDF document text
    • https://umutfm.com/resimler/files/25414912594.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/3815163677.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210904101126.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/69506121323.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/zubejejariwidanop.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/fetew.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/tikokipuvakikabanox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=gta+extreme+indonesia+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_off0000b0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B4 10740 bytes
SHA-256: a05f09291ed51f6d2dc68303f0822f84820642ac569a09d3c54b57b1daf76276
font_01_sfnt_off0000c96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96C 16336 bytes
SHA-256: bc3092db8744069265aad9c4063d659a8eb52b24317359595d83d47611a4daae
font_02_sfnt_off0000f2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1