Malicious PDF — malware analysis report

Static analysis result for SHA-256 d368f675d8508258…

MALICIOUS

PDF

73.3 KB Created: 2021-10-06 01:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7d777b6a160fe53a7b545f59cf2635c3 SHA-1: d721d264b6f3e030558e941432a51ccabcc75584 SHA-256: d368f675d8508258a57098f0a3298e5a0e82877f779814079dc2636c8ebd76cd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest it's a lure for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://studiomanzella.com/userfiles/files/53892717786.pdf In PDF document text
    • https://indobaliart.com/sitefiles/file/45304417124.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/ponesuvakejujimujizuw.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/fedagixiwepix.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/lilumosavebebefisebomox.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/fironugaluze.pdfIn PDF document text
    • http://119pump.net/d/files/pekokarebaga.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/rofamikekozofivekilewepag.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/64878210779.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/75732538034.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/rotiwamizemufigifoda.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156399593f83---turog.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/jijexazi.pdfIn PDF document text
    • https://norservis.com/files/files/dikekiwegupomabo.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/nubabofa.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/migagudit.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/87206854618.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/kawexokokoxubimuvivefil.pdfIn PDF document text
    • http://519pf.com/userfiles/files/ninulepewaru.pdfIn PDF document text
    • http://belv.ru/userfiles/file/kamep.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/xirujenujod.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/zizarumovafozejoxirozuji.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/7922107847.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/depupemipojugebobusotipu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=history+of+clinical+psychology+pdfPDF 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_off0000bab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB8 17088 bytes
SHA-256: 4c3075e89f57cdfe7e37ddbe55f3a327befb50237e92ac3803c6bd4a1e9b65ec
font_01_sfnt_off0000e695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE695 10872 bytes
SHA-256: e4ccabe8ee1659b5c2948d43de7be4c125accc59810206b0ab66808f3405575e
font_02_sfnt_off0000ff70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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