Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5aeb2c3fb8826c6…

MALICIOUS

PDF

70.7 KB Created: 2021-09-27 12:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8d26c2b023b407b6ffa674a173df8402 SHA-1: d2a4d519ffc8e7b6a1bb88f2205a1f2d89345c30 SHA-256: d5aeb2c3fb8826c69c6e58f9c3e971e55dfd719ff5230c7e3563285c0cbc7570
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm with numerous disposable URLs, suggesting an attempt to obscure the final destination and evade detection. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • 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://swiftnb.com/ckfinder/userfiles/files/rapizozoxebatofuligax.pdf In PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/29939542235.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/56253149521.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/rudiwaruza.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/48389432898.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/wenekibaruwezugibesamodas.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/lugod.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/japuraxuxatududofa.pdfIn PDF document text
    • http://shahgrp.com/uploads/vofidejojogerewumipuwar.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/45121118656.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/70633491784.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/sidoxonegedesizekap.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/60023247071.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/43955286030.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613720510b486---23614444820.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149f3e850993---29389571238.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210910113140.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/sinupiwu.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/jiwikajuxomakizolijuzuma.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/95274927966.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/85677766593.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/33171860787.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/benurefikovaxi.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/nedadekesaxedotem.pdfIn PDF document text
    • http://186086.com/upload/files/54185689839.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+reject+calls+on+androidPDF 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_off0000b43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43E 10572 bytes
SHA-256: 034ceaf55fb3b840bb01553042a09d342ab0b71a771e013369aeb8c5858d0484
font_01_sfnt_off0000cc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE484 16036 bytes
SHA-256: b07ecf9e817b5c66f8d761bbb3d6c1488a4a55f2b19e7360aab2529b1f44706d