Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f7e915e671d164d…

MALICIOUS

PDF

68.3 KB Created: 2021-09-25 05:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2cbe913ab821e208c60e2698efe63c52 SHA-1: f42eb1cb27458a0d59a6205985997bc0fcdaaa55 SHA-256: 7f7e915e671d164d14198de8cc98ada37ab0927d0d619998149c99d546df8e53
126 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://chaitraglaze.com/uploads/90837472956.pdf In PDF document text
    • http://jtg-antracyt.pl/files/file/65191271082.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///50543997693.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/62558494204.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/zosul.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/motojugadenumeladolos.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/82332505409.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/98132867008.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/16364994616.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sovenilig.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/baxowabutesavujubojapodam.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/disorexalokemuzunifabon.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/df724f305ead9d42fbdf8d2a13f6ac4d/76180789221.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/ludetenobadikobo.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/86e4ddcd1c6573ae0b34b7ba6906c92e/72967577893.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/38315157776.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/tisufizuvikesubuk.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///rilulugoxirusokes.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/47104735723.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/wogarurexiz.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/40174397066.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=android+secret+tricks+and+codesPDF 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_off0000abf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABF0 15960 bytes
SHA-256: f4cfd97fb8fc10a5264e5cb78b4cdfdba699e66c582bdebad9491fa8782cf72d
font_01_sfnt_off0000d454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD454 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6B 10392 bytes
SHA-256: 337ae72363dda78fda1b31b73e50c577d46e3fc716d60d23f971c68f087dbed3

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