Malicious PDF — malware analysis report

Static analysis result for SHA-256 026f8c36625da80f…

MALICIOUS

PDF

71.5 KB Created: 2021-09-25 23:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1d9bda7f25f1ad2592c3b750d4218bed SHA-1: ea449b6440fd8a6bb661aad9feacdcbb8ad0f0a9 SHA-256: 026f8c36625da80f6a5841429906b73f7c43ef6998bb4fa7c24365846aa7243e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://oniceh.ru/uplcv?utm_term=sword+art+online+alicization+war+of+the+underworld+english+dub PDF link annotation
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/b7a51c6baf5a5180d45d5db7ed2872cf/fopilafogaje.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/tejijo.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/68696104877.pdfIn PDF document text
    • http://aweibel.com/Photo/file/fawebewatifi.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/somigalibitamiwilene.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16311093203406.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/21226114437.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/bovadixoxamut.pdfIn PDF document text
    • http://deltools.com/userfiles/file/83021748396.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/1236013826614bc2d427873.pdfIn PDF document text
    • https://norservis.cz/files/files/28098874204.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/60643804734.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/70664124639.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/sebefamugivedu.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/nefadilifazav.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/jusovesij.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/51210841473.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/34774066348.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1c263883d---67664538984.pdfIn PDF document text
    • https://vietcuongcorp.com/uploads/news/files/98709199984.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109070645172229.pdfIn PDF document text
    • http://sartor.ru/upload/files/62070364823.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/40303585368.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_off0000b110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB110 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC927 11216 bytes
SHA-256: 8f0d4e51b04cfc7f02575de56fe6170547c832427292050f8ee9758e7067c4df
font_02_sfnt_off0000e333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE333 17812 bytes
SHA-256: effc25f44bba379ee298a51a20b5f9d80e34189487808bf274a01256f88cb5ff

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