Malicious PDF — malware analysis report

Static analysis result for SHA-256 f22d2d4259e51c74…

MALICIOUS

PDF

69.2 KB Created: 2021-09-25 10:37:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: de466f18de9573f253dc174b3e88e9fc SHA-1: 0a85551596a02288c6658ff8afc90c5f87d0e7d7 SHA-256: f22d2d4259e51c7413e900aba8320e5bb32c38f8b8e695dad3bb7c55d27146e0
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm, indicating a malicious intent to redirect users to potentially harmful sites. ClamAV detection and ML classification strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for malware. The presence of external URIs and the link farm heuristic point towards a tactic of overwhelming the user with links, possibly to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://medvor.ru/uplcv?utm_term=wolf+launcher+apk PDF link annotation
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/viraxebo.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/5732572116.pdfIn PDF document text
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/80653491362.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/mebivar.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/jurorexotiguv.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423f49cb282---davomiwezebifa.pdfIn PDF document text
    • http://temple.mo/userfiles/file/48704968243.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/61340126288.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c090401259---tiritajeg.pdfIn PDF document text
    • http://columb-sklep.pl/userfiles/file/pofiluzopigexa.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/lojajazajalipiga.pdfIn PDF document text
    • https://denimder.org/resimler/files/nubakozopavoto.pdfIn PDF document text
    • http://jaqalsports.com/files/file/98747707343.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/nazebobexase.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/sapen.pdfIn PDF document text
    • http://proxima-design.cz/files/file/77898651407.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/69770822545.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/40648069520.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/4610781559.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/vavefeborerinowetafo.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/rugob.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/89921722513.pdfIn PDF document text
    • https://quizai.com/uploads/files/44558288626.pdfIn PDF document text
    • 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_off0000b0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E4 10404 bytes
SHA-256: 9fe3c7bbd1717524c85dd983b28ff4d3adbbf1e35d16c76f4f99fb095e8311ab
font_01_sfnt_off0000c85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85F 15444 bytes
SHA-256: 48f1a8c6f535178c0f6a1ad1bd355df39b63badb8dcc0167861a72f67578ee5c
font_02_sfnt_off0000ef43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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