Malicious PDF — malware analysis report

Static analysis result for SHA-256 01b2bf0faea74316…

MALICIOUS

PDF

76.1 KB Created: 2021-09-18 16:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dbd323b8fff7d9fff4871124ee9a75c4 SHA-1: dc261f6ce2f96943a3fc79ad9236a985490ed5bf SHA-256: 01b2bf0faea743161018735b4fa77ee77000baec265491aa0ad6a93b064287f6
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely for phishing or malware distribution. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://gmei.lt/ckfinder/userfiles/files/fidudamowepenimazepamap.pdf In PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/29873043059.pdfIn PDF document text
    • http://uhorder.com/upload/files/1943768289.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/76725632639.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/74417397951.pdfIn PDF document text
    • https://gibidesign.com/fckfiles/file/50350984044.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/u84ehb6736kv2pftmdg1389jj2/39519214322.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/4613985701.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/53477001994.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/27520325104.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/33058618834.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/22958081029.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/xirumoseludaxinewow.pdfIn PDF document text
    • http://edeins.com/userfiles/file/639568254.pdfIn PDF document text
    • http://castel.lu/userfiles/files/sepele.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/lufuvakupowiguxixukikufa.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/sepuwukakekuxuru.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/banitijeben.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/gaguwo.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/liluda.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/zonegatejex.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/votugomijotuvem.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/lumivogekilobemelevemed.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16140e59f0719b---xazogugugunojinopemamog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=restart+your+phone+without+power+buttonPDF 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_off0000c46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC46B 17544 bytes
SHA-256: 7fb449cf129d3f0fe38b15afe52e3ce0897021f81728bdcb72ba36c2ff81a356
font_01_sfnt_off0000f1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CC 10788 bytes
SHA-256: 2c2a448ee2f2c44db1f2adb376cc9f3aca46d24dd6ddf5ca11fce25014a967ea