Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbff4871f43025c6…

MALICIOUS

PDF

80.0 KB Created: 2021-09-13 04:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 32a6eba2d340088e861e77032b3a163b SHA-1: 826977a32a4fa7ca62c96f0a641becf05907890b SHA-256: dbff4871f43025c61e99aac7bdaf60b94c3d5f315b2266e96bf3a029bbb9e1a4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://jshtextile.com/UserFiles/file///73263371779.pdf In PDF document text
    • https://breedlife.com/upload/files/sagulibisom.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/fivip.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/dipejuno.pdfIn PDF document text
    • http://rs-entp.com/upload/file/guwepixavabadu.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/nagitonejudoxedukedevalu.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c70274e6f0---69680061203.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/gotivap.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///jevidig.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/76883790697.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/7024497286.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9292e015c---1111641674.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/57508586725.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/ratusipisupow.pdfIn PDF document text
    • https://pecsikult.hu/files/file/wanos.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/09/file/202109022207211414.pdfIn PDF document text
    • https://umutfm.com/resimler/files/94416153350.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/nanosumifujetib.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/2721990866.pdfIn PDF document text
    • https://coop-alternatives.fr/images/images/67317406677.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/60137150588.pdfIn PDF document text
    • http://hodori247.com/uploads/files/41118641610.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210902115849_c2lkdXZhdmVn.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/xanegefete.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=igo+world+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_off0000d4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB8 10064 bytes
SHA-256: b5d15a9622ec1b5183c83aa0bbd263e21fb418fcd8af433a37d8b0253d0e2e94
font_02_sfnt_off000102e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E6 18592 bytes
SHA-256: 73526a7d143b94e29af028e48616148916096267cccc4909af9bfd545a256219