Malicious PDF — malware analysis report

Static analysis result for SHA-256 06f1b4fefba74c92…

MALICIOUS

PDF

76.7 KB Created: 2021-09-17 19:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2346ae0aaf54a0d85e581697d6996d93 SHA-1: 82085f6fc5fe0ac4f55c60927be82465a2cfcd95 SHA-256: 06f1b4fefba74c9244efeb0d6b1c165f723910c861bca673856d1da37daa6222
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, with the primary lure being 'download texture pack minecraft pe android'. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an attempt to redirect users to malicious content, likely for malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://mutitar.com/user_img/files/39573836774.pdf In PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/zeweziriladokawoxe.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/24582805789.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/32528137323.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/2348295921.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613689dadc193---16061103241.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ca0fbba0c---tarodawabuzanaduli.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/kuzerezusubinonowolapefom.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/76681024512.pdfIn PDF document text
    • http://ms-domino.eu/images/file/files/piralazebesux.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/naliran.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/daguvujivame.pdfIn PDF document text
    • https://themalc.org/files/file/kewepujozupimofatomalosew.pdfIn PDF document text
    • http://sdds.be/userfiles/file/87220040914.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/26648837748.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/feligexemenerulamu.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/zugofitasozojon.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/dekexefene.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/9926311998.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/dejedakupi.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/6867613784.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/19552984348.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/65154610423.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=download+texture+pack+minecraft+pe+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_off0000c73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC73B 10996 bytes
SHA-256: 8bb1c50ef791c2801323f22f5ac14f0545d5af7dbd4aae73e944e7aa120c013d
font_01_sfnt_off0000e0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C6 17508 bytes
SHA-256: 3c802e13fcabcbb8f71cb0e02256563b1ac0a87300e8d97e7fa7e6c1c42eea39
font_02_sfnt_off00010d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1