Malicious PDF — malware analysis report

Static analysis result for SHA-256 984c82ce00ca7791…

MALICIOUS

PDF

81.9 KB Created: 2021-10-04 12:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d91e8ed5958a95fa45174282893d5bac SHA-1: 457c31f89d8040e8dc6ba426cc3f2e42614fae47 SHA-256: 984c82ce00ca779138ffcfb4d404c2111e4e6e5101f8905cdb2fc6d367773c38
126 Risk Score

Malware Insights

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

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://officeharbor.com/pdtInfo/81415008779.pdf In PDF document text
    • https://shevian.com/images/file/76290144320.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/29113667553.pdfIn PDF document text
    • http://chemicalengineers.ie/images/68040723619.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/7060885141.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/74379486234.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/8435049810.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/darokibapirob.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/moteloz.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-10/20210910102529209008.pdfIn PDF document text
    • https://susta.vn/userfiles/file/jojuxawa.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/5560379285.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/lotokagivedozakomewifa.pdfIn PDF document text
    • http://belovosushi.ru/files/nilib.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/95686574134.pdfIn PDF document text
    • https://data-face.noithattoantam.vn/userfiles/file/duxuvubixasipolurafese.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/serapidoponuzuvidalawo.pdfIn PDF document text
    • https://franchiseinnovations.org/broker-site/files/files/bawajuwomomawixi.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/vagokoguwumubotimul.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/vowewizumarevafixilemolo.pdfIn PDF document text
    • http://hidramaco.com/files/files/45881545982.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/sureladiri.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/fuwususip.pdfIn PDF document text
    • https://flyags.com/editorResources/file///kikaxalojabivazo.pdfIn PDF document text
    • https://angkaindaman.com/contents/files/74239796851.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=passing+out+and+having+a+seizurePDF 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_off0000d95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95B 18676 bytes
SHA-256: 658ae2396d7bd88ff208214a2639f7d4d6fd2772406d59eaa7f21c0dc738e205
font_01_sfnt_off00010959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10959 10708 bytes
SHA-256: d18640c02e4db5445e8afeb71a4ba6fc17b0df44650c79732d94a95d2df186eb
font_02_sfnt_off000121c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1