Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ad446a2ff597ff…

MALICIOUS

PDF

75.3 KB Created: 2021-09-13 16:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c2d901220bcdcef0cae0f2cee46fe4fe SHA-1: 66b97a218fc8734fa44a2b7a757afc1ffc51fecc SHA-256: d7ad446a2ff597ffca4777c846d0a44c943a5dfa101e669e4bc0a742d1afeda9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically classified as a phishing trojan. While no scripts were directly extracted, the structure and embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=two+most+populated+countries+in+the+world PDF link annotation
    • http://jcnjl.com/userfiles/files/ladufepuvekakitakufutodim.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/jidigofigipowax.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/jt187ht6rrqfaukpsa4eb9kh95/77894617243.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/15721386685.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/40551478247.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/gasabetegajaxane.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/7050234930.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/93825897673.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/41134505098.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/66073149536.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/80873022934.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-8/20210908191449991996.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16131e2bbbeecb---verizokolepuperige.pdfIn PDF document text
    • https://pmms-online.com/assets/file/wakojajumivafiwu.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/lupirajapujuxawumoz.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/78922282868.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/numoka.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/novevemivinuxaxeruput.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/tudowusibipada.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/29959822083.pdfIn PDF document text
    • http://canadanur.com/resimler/files/donamosokokidaz.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/238754638613223e475af9.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/81636802949.pdfIn PDF document text
    • https://lapdonline.org/file/8996818724.pdfIn PDF document text
    • 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_off0000c46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC46F 10928 bytes
SHA-256: 435df23ccda6af9976520cc9c26bfe845921001fed73fa6309e80d91056a393d
font_01_sfnt_off0000dd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD92 16352 bytes
SHA-256: c33a17ad775f95fa3e8d0a5ca2f2ad960e8fa627eebad43fec1a257c9fde5a96
font_02_sfnt_off00010779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10779 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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