Malicious PDF — malware analysis report

Static analysis result for SHA-256 509e0ab641c8b89f…

MALICIOUS

PDF

72.1 KB Created: 2021-09-10 04:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9266c50aea51e9eb73114ac0da52d879 SHA-1: d4625981d19702e79b3098eeeacb8b59609e3be6 SHA-256: 509e0ab641c8b89f04e2deba3aa89b88e881f810abee6c10935e8e61214bc899
126 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or SEO poisoning campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lovelyspa.net/ckfinder/userfiles/files/75101395710.pdf In PDF document text
    • http://www.gabrielamaciel.net/images/content/file/reburewo.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/bewebaluvuwidu.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/wozifatafudopapuma.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/tekakaxivuxitolevesikej.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/29723347112.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/xixerobowe.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/14502914697.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/ralivinarosenipeno.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/41212737488.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/90748828555.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/89780818274.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/luposij.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/senafuluzotegubadopasajo.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/wuzomiriloxujokipabubiviw.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/78062283471.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/zewewonobevewibo.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/xafabiv.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/5667892597.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/11083927626.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/86318808324.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/30539507375.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/dameji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=bhagavad+gita+chapter+15+in+gujarati+pdfPDF 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_off0000b36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36C 11100 bytes
SHA-256: bd9fa4f70157db4b8c878d8a59d1a75d2efe5cebf087b2abf1bd54ac493d818c
font_01_sfnt_off0000cd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD27 17612 bytes
SHA-256: e5ac8cfd055993a09459afb15c859fb7d599ec6e629d57b847eb9ff8b219dcf1
font_02_sfnt_off0000fa77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1