Malicious PDF — malware analysis report

Static analysis result for SHA-256 28bf07622296788e…

MALICIOUS

PDF

78.0 KB Created: 2021-09-15 21:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8fad5e97ddf9953b8b77d589d02bf123 SHA-1: 6ebe14d205c73175b03946d220a6bc7d459804bd SHA-256: 28bf07622296788ecaa086f9ed31ef40639ca87efc69250de248eef8537122ac
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pixomot.ru/uplcv?utm_term=how+to+draw+a+sofa PDF link annotation
    • https://searchlink.org/userfiles/file/94647596758.pdfIn PDF document text
    • http://labonscafe.com/userfiles/lotibukafi.pdfIn PDF document text
    • http://fxmeat.com/upload/file/2c5756b7d85e3d562111a4ac67d726fa.pdfIn PDF document text
    • http://ghefootmassage.com/fckeditor_userfiles/file/musixevo.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/95429870121.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f322415ab0---20960099823.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/76930629616.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/zimitaw.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/48386323093.pdfPDF link annotation
    • http://dd-eng.com/files/files/devifekijexopuzupiroten.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/kujixujabesameros.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/taxebejodatibizipibedavav.pdfIn PDF document text
    • http://sbkf.org/files/files/tefuwosab.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/kiratefonexerine.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/77059744476.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133379a0cbf7---vazavemulavatezoboxokolo.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/xovonufafizusanewatilaboz.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/kukolojumase.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/sepemodeletemu.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/walisamesuwolisomuvalo.pdfIn PDF document text
    • https://maturana.cl/upload/file/gibatowimux.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/xadozaxelaseguniwo.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/25533773980.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/36690131082.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_off0000cdf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF0 17888 bytes
SHA-256: cded761e8c8ae873dff867493668c3d247e5ed7c433cfbce7096114d2774cce2
font_01_sfnt_off0000fc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11460 10048 bytes
SHA-256: 7115a17fcc28430fa953850ec61b978770533e4d139ceba676b83fef5493f967