Malicious PDF — malware analysis report

Static analysis result for SHA-256 e32834a106312c78…

MALICIOUS

PDF

70.2 KB Created: 2021-09-25 21:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fd850bc0116f1c475abd8de5ddae540b SHA-1: d038d9daccd799fbda07714cc3c205a0f05ef7c4 SHA-256: e32834a106312c78f957162868afebdd7bfe4af80d1956460bac93871dcc8cfb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to the document acting as a link farm, directing users to numerous distinct and potentially disposable hosts. The embedded URLs, despite some being marked as benign, contribute to the overall suspicious nature of the document's intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://simsoncantho.com/userfiles/file/kozimuveni.pdf In PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161410d3a1b709---tumadujevisivone.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/nirativo.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/90102518260.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/22765024728.pdfIn PDF document text
    • https://bu8m3tas68s-b1.com/contents/files/59717232129.pdfIn PDF document text
    • http://balone.net/_upload/file///9038584243.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/9352228791.pdfIn PDF document text
    • http://intertribo.sk/files/5153176524.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/risopigokawegu.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/15905859442.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/76901417423.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/31840053120.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/fepifobos.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/benupotapip.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/siwonaxifesofonun.pdfIn PDF document text
    • https://mmszke.hu/files/file/vilemexujoded.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/55062183155.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109120757397334.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210902025106_ouwf0h.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/tadovoxataxusisatawus.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/26036242315.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364b442e59f---vozobizegonurexisu.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/resafexise.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=watch+house+party+3PDF 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_off0000b1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1ED 10608 bytes
SHA-256: 76fbf19626b31cf72d4ddebfd8ac41404929f017ce17469ceb44b99a2ee72b21
font_01_sfnt_off0000ca73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA73 15760 bytes
SHA-256: 4cc892b9baded6667b6c07e17f4c8c596dc92f1cae2bd6a9261baa5569820f65
font_02_sfnt_off0000f2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1