Malicious PDF — malware analysis report

Static analysis result for SHA-256 083cc8af53604e4d…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 10:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 936ced49b5c4118f47ca524c0a008013 SHA-1: 2e5a99908b6bf9360f01f800abe2b82e69847e79 SHA-256: 083cc8af53604e4dc5edc081f94c057bfa2aa30439d88e3c75b936957f4033dc
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on disposable domains and appear to be part of a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the heuristic identifying a link farm on disposable hosting point towards an attempt to redirect the user to a malicious site or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://archism.ru/uplcv?utm_term=how+to+set+up+ntlworld+email+on+android PDF link annotation
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/51372920389.pdfIn PDF document text
    • http://wonikquartz.com/upload/editor/file/1631949191.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/38141106948.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/0f600abe4168ffe64fb8029a7c04138a/51407497184.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/86535264491.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/3459991561.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/96138277701.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/dizujilanemupusewew.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/16159436752.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/zodetazerawupexanaxazavu.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/12870025462.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/mopasifevajewor.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/wafobujarutu.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/lijudotal.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210904110551.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/wafegunonakirudujafozadu.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///98781918991.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/nigotik.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/6924475121.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/nufilevujixuguzavixa.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/lanixarurimorituvan.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/63552803260.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/22835432883.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/semuziga.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_off0000d87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87D 10728 bytes
SHA-256: febbd24fb473b41fb7f40a97bccb97498dcb5cc850ab5456e0bd4cbd81d77726
font_01_sfnt_off0000f121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF121 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10933 18048 bytes
SHA-256: 2e346e26c6a6001b7a5ff12fd09f573d1c71c9a3d59f76d460b32efb51826474