Malicious PDF — malware analysis report

Static analysis result for SHA-256 71708383c20e27be…

MALICIOUS

PDF

72.4 KB Created: 2021-09-10 06:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c89ebed7a76768a453b2c2dd63b32b90 SHA-1: dcf4b6ebe8cdd9aef406e231ac0ebbfe46e93374 SHA-256: 71708383c20e27bea86567c955bd0780a6bf479423134bf6eafbb65dcce32a07
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host multiple links, potentially for phishing or redirecting users to malicious sites. While no scripts were explicitly extracted, the nature of PDF malware often involves embedded JavaScript for malicious actions, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://cytairtool.com/test/userfiles/file/20210903_19280.pdf In PDF document text
    • http://balaton.varosom.hu/userfiles/files/15460829807.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/3601846322.pdfIn PDF document text
    • https://solturism.ro/images/file/folefumubor.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/17936444587.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16136837d2318b---35044885612.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/ribipegitafutaliwom.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/punudutugidewumopuk.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/58295677956.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/22119854622.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/63623218258.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/57828646269.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/xifisoniduw.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/71755036267.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/suzodefowonilutodazalen.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/janajereseregevavojib.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109060005249362.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/5f1c15a99c9cd243f2d543596915e4a9/wubowipuluxosasejapizul.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/68187427514.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/37928963045.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109010644139383.pdfIn PDF document text
    • https://techlan.pl/files/file/lojetijogigobev.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/52462623594.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/80823115706.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/duferadozuwaban.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/30013229554.pdfIn PDF document text
    • https://pesonabali.dswip.com/ci/userfiles/files/52662755899.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=android+sales+vs+iphone+salesPDF 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_off0000ba5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD274 10436 bytes
SHA-256: 22f09a8c848be507d82b8c91c09fd090631209e6bff4f59a34beb92c6865298a
font_02_sfnt_off0000ea01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA01 16424 bytes
SHA-256: 803e0301177d5104e0b0d19ae11ad9549d8d29d2af813a7032aced057090ea81