Malicious PDF — malware analysis report

Static analysis result for SHA-256 b758a1ce66105a24…

MALICIOUS

PDF

81.4 KB Created: 2021-09-20 21:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1cf8d223c98372bc56a2d9b57f45a0d2 SHA-1: 6d24c581a2cdaf50633da53239ae88186d0dca9e SHA-256: b758a1ce66105a24b1a421d2048c5ef29a9dc494ac12f7417939c6144a9d45a9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a likely phishing or malware distribution attempt. The presence of embedded JavaScript, though not fully detailed, suggests an attempt to execute malicious code or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=simcity+2000+cheats+pc PDF link annotation
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/tisalejanijizuwilapaxabi.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/rusorukajuxesafo.pdfIn PDF document text
    • http://leeharringtonhomes.com/userfiles/file/juwamurepimawotuvuvamufo.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/21332954296.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/6829858445.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210908155555.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/nuwikebivudokag.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/61418136103.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/fbbc16568fefd33e5015f91f00201acb/16611360288.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/zilotogiwekud.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/gexona.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/33541030643.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/rirebatanepudab.pdfIn PDF document text
    • http://17njl.com/userfiles/files/bexezofugikurewexagurusi.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/takisexir.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/9438776132.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/kffvn7hg3qerdj9hv7idhplcao/pariluwesapujobu.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/luzedipinivadupe.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/jelasas.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/1452220595.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/26192330041.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/pupolufijonevetibodalanep.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/58939572118.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_off0000d8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF106 17708 bytes
SHA-256: 6d8656a8af11f840f94178a6738aab512f6e22132ef56dd8d7b11f107184b6d4
font_02_sfnt_off00011f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0F 10700 bytes
SHA-256: c0316b740666e42fc2f60025a7388a897e9caeb79706b46a754e37d2b52b1863