Malicious PDF — malware analysis report

Static analysis result for SHA-256 7480312da5869383…

MALICIOUS

PDF

69.6 KB Created: 2021-09-10 20:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c44e866b0855b3a3f982fe1569cd4d0b SHA-1: fabf92f57761fe65bef171b311fbc01291ff8a18 SHA-256: 7480312da58693838650121130633a8bc9e4db30f4f5bab3cb35c178a68e0a91
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic analysis identified it as a link farm with numerous external URIs, suggesting a phishing or malware distribution scheme. The presence of many distinct hosts and the 'utm_term_redirector=True' flag further support this, as they are common tactics for obscuring malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://zoscm.zohukum.com/ckfinder/userfiles/files/8737006212.pdf In PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/oq6j6qauchhppe56pt8es530uk/liwowozimujajaned.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/gazerodowuzulig.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/bidatopemuporipifinupefud.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/5938710747.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/bopeloxex.pdfIn PDF document text
    • http://beta-rc.com/upload/files/54809007649.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613036cde659e---lufuge.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/17256610168.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090612364973499.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/puguriramofijezowigefi.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/xewenolalawibo.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/25323672589.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/turojube.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/74312461537.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/pirisogozo.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///85865616935.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/91019735247.pdfIn PDF document text
    • http://topflexsports.com/uploads/begiwawaxoxukovoxegodiw.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/tigijavu.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/fokinivugasofogozupugev.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///dokusugofevatusadewipimot.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/38521837853.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/10689441685.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/42744375031.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/xovavoxezikuwabosi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=android+install+downloaded+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_off0000b4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FA 10544 bytes
SHA-256: f6cdf3eb10927ac01ffac672f8051246f285717d07023370b0298ce70d0653a7
font_01_sfnt_off0000cd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2C 14184 bytes
SHA-256: 567530e4a7a06f3c1d9fa6d2f417651e8413069f80e557d5c4803eaf25d551fc
font_02_sfnt_off0000f098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF098 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1