Malicious PDF — malware analysis report

Static analysis result for SHA-256 b89d4e556c7474c3…

MALICIOUS

PDF

74.9 KB Created: 2021-09-13 04:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1dd632ab42cc39556cdf6847a783a54a SHA-1: 619e1b595020ae462059ede9b99dfa453ad25710 SHA-256: b89d4e556c7474c31441be4cf882fb2a8b55762f3738315e017f165c10574eb1
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. It contains a large number of embedded URLs pointing to other PDF files, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for distributing malicious content or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ideylia.fr/uploads/file/71290874970.pdf In PDF document text
    • http://maxidmum.com/images/upload/fck/file/83447268496.pdfIn PDF document text
    • https://polandpools.com/contents/files/88878809772.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/vakepivumaxe.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/lemutokilozatapa.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/tufaxej.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e5faefa4c---74563908898.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/41270288222.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/pegoperofepuve.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090917241392.pdfIn PDF document text
    • http://lysfyyy.com/upload/files/fedikonolelidinodumite.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/kulalefisewamex.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/kusibagusepen.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/26727632139.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/bosimosikagozegibepur.pdfIn PDF document text
    • http://www.moyekolodin.com/files/daperesepuvar.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/vebufu.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109031523387560.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9f294efce---67757903862.pdfIn PDF document text
    • http://kleiberit.ru/files/file/29457521209.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/zuzipodejegepedes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=eyes+wide+shut+123moviesPDF 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_off0000bfb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C8 17100 bytes
SHA-256: b1a99a5644cf358e2c5383d302060efb48f396896342caa4e5034f6c3ddc82b4
font_02_sfnt_off000103c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C4 10796 bytes
SHA-256: caf20abd120cb14f242bb4fb964432774b855f7816b94dc9aa7755c9dc80c5ee

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