Malicious PDF — malware analysis report

Static analysis result for SHA-256 f673650ca5db39e9…

MALICIOUS

PDF

70.2 KB Created: 2021-09-28 06:37:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6925c52f9b0d72eb34ee8884192def31 SHA-1: addc5481ab8a26cd2457c92324242467234e4ba1 SHA-256: f673650ca5db39e9e9b2bec55fa8db4d8058c4541d0600c6a177b4ba4cf7f1d9
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 phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a link farm on disposable hosting, combined with the 'utm_term' parameter in one URL, strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://santehnika34.ru/images/file/31473270894.pdf In PDF document text
    • https://etcbt.com/userfiles/file/mukuzogepumakufutijowu.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/ruvilujoxesurose.pdfIn PDF document text
    • https://shibbirs.com/media/files/92160686345.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/22716870947.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/faxoselekexawudeporotagiz.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/fifumerunikawewaxe.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/bofopa.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/58871482242.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/32981866471.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/pupodotigipofomategibikop.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/metijog.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/16559601225.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613429f6b71c4---6336751334.pdfIn PDF document text
    • http://njchemland.com/upload/files/58459276068.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/74448518277.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/18229547374.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/79567898465.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/78382171496.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/livipisibuses.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/temaramedajukokefasesu.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/84819938631.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/mikikataweba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=episode+apk+unlimited+passes+and+gems+2020PDF 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_off0000af82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC799 11052 bytes
SHA-256: 56bf0483fd90aac7f8e32e6e8ddeb63c43021e164ca0907e8c61029d2f768699
font_02_sfnt_off0000e127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE127 15956 bytes
SHA-256: b394d814ccb26c45a79386d56bb6cc90dd2ea1d4cadad56a0704801de27f4e8d