Malicious PDF — malware analysis report

Static analysis result for SHA-256 42badd6aa9751807…

MALICIOUS

PDF

85.1 KB Created: 2021-09-17 23:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d918e802c9fed74e813a8854218fb87b SHA-1: 4579bc38c780ad0ae1919e412d5e37f97ce80515 SHA-256: 42badd6aa975180748199f9e12362db721db0d7fd30761149bd708fae7d49c08
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://cherrychile.cl/cherry/uploads/contenido/files/31232190714.pdf In PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/bokixatorejuf.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/61852946045.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/65421156000.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/7683166366.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/10565819082.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/vugokabise.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/zofawe.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/belibi.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/452304821612ff2f0bb9d4.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/9305114432.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/wemabotufokutitepug.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/sogurinifizofokulijesa.pdfIn PDF document text
    • http://proficlim.ru/public/userfiles/file/domikivimeb.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/vurarawajapadaluvalasapi.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/26425563256.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/24264858880.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/nofax.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/5849863719.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/20353094881.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/99855315488.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/kaxepado.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-03/210903141614352077gsmbdo5ao3ow.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/lelijeranatezabed.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f699818999---pibolew.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210908040624644.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/kuxukutojenovadipovugaku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=longitude+and+latitude+globe+mapPDF 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_off0000e5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DC 10664 bytes
SHA-256: ebca90782308220e1f586c8ddc92fcff0db49d9ef935ba68e83ad1e362ecdd3f
font_01_sfnt_off0000fdc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC8 18540 bytes
SHA-256: 0faf9fbf4cc524bacab915d709e54c11e8a1fe5f796fdcd9735d17369e610f1c
font_02_sfnt_off00012e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1