Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff14ff33f9dc16bf…

MALICIOUS

PDF

74.5 KB Created: 2021-09-16 15:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d954c5d1297c6ac1e02f7af7e7250d38 SHA-1: 3a83b1ae3f8a4ca1d1acadb23097d07531f34eac SHA-256: ff14ff33f9dc16bfd23c4a13ac2ee1fb5802d55a3981e29c48eb99b13e84fa14
134 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains a high number of embedded URLs pointing to disposable hosting, indicating a link farm designed to trick users into downloading further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yasaitogo.com/uploads/files/42135402016.pdf In PDF document text
    • https://auto826.vnpec.xyz/uploads/files/15395716779.pdfIn PDF document text
    • http://change4best.ru/upload/file/muzanepakasejopaperedu.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/poboxukibijanowu.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/80765998687.pdfIn PDF document text
    • http://apismorava.eu/docs/9899549897.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/netajodipeku.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109080522497762.pdfIn PDF document text
    • https://cecprint.com/images/file/83318671431.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/29003046051.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/soxakiralamaku.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/75037266561.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/xavikizilivufubekutujuvu.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/gikivevaz.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/xivij.pdfIn PDF document text
    • https://kratky.eu/files/file/mimirepoguzog.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/70392338207.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/95995822736.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/62326651113.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/kifikix.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/44672303073.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/77302928769.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/xaxojak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=message+recovery+software+for+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_off0000bf5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF5A 17260 bytes
SHA-256: 5e6d89e4d90c7db8e0e086e147d09bf1b8a44931c4f60b5cdbf84aaf2b8c5dc5
font_01_sfnt_off0000eb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB39 10864 bytes
SHA-256: 5fb796e33dd89181dfca29aa1bd4fa1505f98e4899c2015ca7850ba235dd5edb
font_02_sfnt_off00010463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10463 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1