Malicious PDF — malware analysis report

Static analysis result for SHA-256 da141b0c37afb19f…

MALICIOUS

PDF

89.0 KB Created: 2021-09-18 19:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: dd0d43fc32a928e0db981c14660a4282 SHA-1: edaf9caf1c591a0c08071cf67aa21a2a833f9dbb SHA-256: da141b0c37afb19f3e28b292c87565549c1a8368a4bd19b243da6bd45523dc48
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. ClamAV detection and ML classification further support its malicious nature. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=no+19+dragon+ball PDF link annotation
    • http://manpukulivermore.com/uploads/files/78824737490.pdfIn PDF document text
    • http://finchamauto.com/pics/18412604016.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/35425797981.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/dawuge.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/85560733704.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/38464505619.pdfIn PDF document text
    • https://asken.as/bilder/file/bimiw.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/xepifedujukeworajulirog.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/bumesunuratilelanujim.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/68474614531.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/28405948575.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/wenib.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/jajuduzologubugokaxuf.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/nonuzulem.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/11702814037.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091411553882.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/44188084281.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/ladibujuwirob.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/93548231435.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/79338908513.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/e2eb91eae3e06654e382c3587d71a2d9/6489495823.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/jofodibawapukubur.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/pepusenowuwelumidanuge.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/wosisigitupitunuguwelud.pdfIn PDF document text
    • 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_off0000f5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF2 10268 bytes
SHA-256: 89f936a4dfa4bc55dc7af44aee1168d925aea2e5a4d2e8a45422f756c10d7620
font_02_sfnt_off000124f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F6 18836 bytes
SHA-256: 827101bda1f0d1205b88cda4ae229902c02b9f54a5063029e3cd35bdccdb7059