Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b102930d088eaf…

MALICIOUS

PDF

81.8 KB Created: 2021-09-21 15:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9abd3ffc31f0d6b3d1685e63ddcaade5 SHA-1: 74c7828b0936a02f010421c7375a1e279cb40ffb SHA-256: d1b102930d088eafbf970c27ce7b0cb4ddbf6a8088ca4193542bf9d046d1c654
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with one heuristic flagging it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to obfuscate the malicious links or to directly execute a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://ternovykh.ru/content/file/debeguvigizeguja.pdf In PDF document text
    • http://swvocal.com/data/se2/file/31109432625.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/17805116349.pdfIn PDF document text
    • https://euchebnici.com/img/file/nitivoxopofan.pdfIn PDF document text
    • https://happen.webasl.com/userfiles/file/57530814619.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/68396576630.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/69854127375.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/mazepita.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/131c89944e5154d4d0c31c4b7043d6b6/nugogobi.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/75299018349.pdfIn PDF document text
    • http://nova-auto.com/upload/fisubazoxafijonunonegaj.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/72127437490.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/zepawuluvafemivuzoru.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/47496848027.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/38843091432.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372dd65c663---ledomoreruledaredu.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/fodogudunubegiwi.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/27122914725.pdfIn PDF document text
    • http://osayit.com/images/file/47030590656.pdfIn PDF document text
    • http://ubest.ru/images/file/titubi.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/41872339197.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/4935352003.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/26124257101.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/22012827359.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/gixinazijumudezelari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=download+prisma+photo+editorPDF link annotation
    • 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_off0000d7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7ED 18616 bytes
SHA-256: 41fa8bc881095b0abdc3a8c76573ab5a78768629f6848191ef135198e94e9792
font_01_sfnt_off000108af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AF 10744 bytes
SHA-256: 4263e3697bfde02bf53518a8a23bed47c351cc09ffaf61781079d0030b344ead
font_02_sfnt_off0001213a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1