Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5b4f9f6e4faf800…

MALICIOUS

PDF

68.3 KB Created: 2021-09-24 20:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 862e9ce40787cd2dfa6cd99f633afd6e SHA-1: d2d004a3405a724fa8d1050e31acd3bdb3020ec0 SHA-256: b5b4f9f6e4faf8004955137ea6964398ccde8e186229570a8385bade897df32d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristic analysis identified it as a link farm with numerous disposable domains, suggesting an attempt to redirect users to malicious sites. The presence of embedded URLs and the nature of the link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://fratellifurloni.it/file/40341547094.pdf
    • http://adria-ex.com/images/blog/file/leretizipemowipobiteroxar.pdf
    • https://geneolock.com/locktactyuma/userfiles/file/92942270800.pdf
    • https://sankaibearing.com/userfiles/files/luxutufabusaroneki.pdf
    • https://ncvpte.in/userfiles/file/pujonajetagowafadoxu.pdf
    • http://galsabino.it/userfiles/files/42206510990.pdf
    • http://technology-mp.it/userfiles/files/91195438795.pdf
    • https://idd.no/ckfinder/userfiles/files/74857940123.pdf
    • http://begues.mobi/userfiles/file/39340288411.pdf
    • http://lyzph.com/userfiles/file/Fl202109041555432586.pdf
    • http://tetraeng.it/userfiles/files/36495774319.pdf
    • https://lajovisena.com/gallery/file/befevefopusapideniv.pdf
    • https://gloriamus.org/Uploads/userfiles/files/vules.pdf
    • https://printsolutions.printsolutions.bg/uploads/wysiwyg/files/wibajawu.pdf
    • http://tw-tms.com/uploadpic/xw/files/884393646.pdf
    • http://konberdbio.com/upload/files/fagiboreku.pdf
    • http://meditopthailand.com/file/80640757317.pdf
    • http://panel2conso.com/userfiles/file/fexekurulenisegekow.pdf
    • https://sadhankendra.org/erc/media/57930136917.pdf
    • http://olddieselparts.com/ckfinder/userfiles/files/lamimidozozuzoxam.pdf
    • https://servingltda.com/userfiles/file/31094957299.pdf
    • https://bunyaminerdemir.com/resimler/files/9051135692.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134363300f13---varufasikelajamobelutina.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=best+online+radio+app+for+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ada3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADA3 16792 bytes
font_01_sfnt_off0000c5ba.bin
1a01804b43ba657e65683f6d9c38edb566ac8bb3b23d5bd99c1ec9c2f49d2704		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BA 10544 bytes
font_02_sfnt_off0000ddda.bin
f82a766903a6b29202e9f50e24d9a9bb9ebf6809e3b2baf6687cf47ac2ed3e8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDA 15136 bytes

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