Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed4eac28f95ed4d7…

MALICIOUS

PDF

69.0 KB Created: 2021-10-01 08:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ef00b6f3392ab606ff99078639da6d50 SHA-1: 5689d8f13ccb76551bdb23a858d42deab0ec40be SHA-256: ed4eac28f95ed4d74fcd5e4dd14f7aeb9f2b7ebde7452984660ea41724fec8e7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV and an ML classifier as malicious, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is designed as a link farm, pointing to numerous external URLs, many of which are hosted on potentially disposable domains. This suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://harlit.com/ckfinder/userfiles/files/20210926_211143.pdf In PDF document text
    • http://kaies.net/upfiles/2109121849211373823tl1tr.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140b9a8215ce---fawila.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/20275619095.pdfIn PDF document text
    • http://noithatvietsky.net/media/ftp/file/86800919776.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/28052631468.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210904152313.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/pikevafakagupose.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/96541616656.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/33336361443.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/4247982606.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/23555843663.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/13936583381.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a19bb2d7a---zuwuxojexatijolexo.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/fuvazotakojipebagavu.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/49026798810.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/wimarakuluxuture.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/dazifufux.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/42838394822.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/poxabebibomatakukitoziju.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/tilekomebafujegibo.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/nesutijetiritoralekonoza.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/73911095614.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/88914436224.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+connect+ps4+controller+to+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_off0000aeed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FF 15348 bytes
SHA-256: b0c95559669edec16294930aa210a1dae788c266ecd65f325ce120fa9d6930f4
font_02_sfnt_off0000edcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCD 10660 bytes
SHA-256: 1b0b6f87f37cc25418254f3523d36ba3d1fc57ab9fbb4d6c59f754fd780ff49c