Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f7a6d3534e38619…

MALICIOUS

PDF

72.7 KB Created: 2021-09-09 00:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 26d406ff71e7a9793984202aec3b09a7 SHA-1: 8f37fed345dd896f54f604f44f14ff1a719d3ee7 SHA-256: 3f7a6d3534e386191f5178210ade7bec845ee97e06ee9b3ae0e5a2ef721edf45
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects to external URLs, as suggested by the PDF_URI and EMBEDDED_URL heuristics, which are often used for phishing or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://bodybybodyology.com/ckfinder/userfiles/files/turipikeruwekogux.pdf In PDF document text
    • http://deforma.it/userfiles/files/59435793904.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/mumebetolob.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/23830434441.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/46288120699.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/47167764665.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/2825239032.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/logakagixiza.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/30369621130.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/34608618891.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/23748321386.pdfIn PDF document text
    • http://ge-mak.com/files/4036525691.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/rasudazubiwifarirefiseni.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/zujekuno.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/rezelidono.pdfIn PDF document text
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/batoge.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/88912890490.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210905225619.pdfIn PDF document text
    • http://techmechengineers.com/uploads/zerovelozagopoj.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/67431484424.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/10837110706.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/tizozuwikafevebogavori.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/dofutopedoxadugim.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/74094032574.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=incognito+tab+shortcut+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_off0000baaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAAF 10664 bytes
SHA-256: 540a0c37c2d66b2ad2a65dc9736cb5bd8f2cbf60e3f332fd5d737c66ee6ce94b
font_01_sfnt_off0000d2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eaf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF4 16272 bytes
SHA-256: 7e7c43bd090d7d04a8ddd6fc8564c4ed14d7d540637e7427b3a2ac025c6231be

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