Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6fa23d634b7d8f6…

MALICIOUS

PDF

80.5 KB Created: 2021-09-13 09:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 33002deee81108ec229d6e6b60cd237c SHA-1: 8fbcc3882898606c3e4b5fc73914fe405748bda0 SHA-256: e6fa23d634b7d8f69d255650958142f2a4b07e681a0df0cd6192375acc0b57fc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://condicionamentofisico.com/arquivos/file/wonemede.pdf In PDF document text
    • http://mywayrtk.org/userfiles/file/wofiramunalopuxinifemel.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/dotusinad.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/67976035427.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/rinugotojoriwiwim.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/80628355561.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/90273089914.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/pimonujadagogegojomer.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/bivikamoriketeno.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/gubowejunuwirewevabunibip.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/tulibogi.pdfIn PDF document text
    • https://nenanhduong.vn/Upload/files/tumixe.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/88927817241.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/wasitiru.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/62074301994.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/28947420965.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/54985082427.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/poxelalidimiwo.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/zonubotabilarejanuz.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/bukubevosulevabiga.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/xilewatape.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/rimimitafo.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/52173531646.pdfIn PDF document text
    • http://timocomputer.cz/files/file/36112947022.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/weduvufowedogedofeju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=android+phone+conversation+recorder+appPDF 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_off0000d6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AA 17516 bytes
SHA-256: 8fbe73f25e637d23b552453dc3c716eecd42843ad7252a0e0e22ce2c803b5f53
font_01_sfnt_off000103cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE4 10612 bytes
SHA-256: 3324ca0de020a51868990aefb3a15da75b06eb9911b019f4e782f2914bc1a1a8

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