Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5eadbd519b8cf8…

MALICIOUS

PDF

82.0 KB Created: 2021-09-20 23:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 95ec64991375c3c91eb45c432e30ab6f SHA-1: 542046675d51c081ba8a52a9bdb70b360c2038d3 SHA-256: db5eadbd519b8cf8941c7b4497637af0d5a3b4652ab73013bc231d3ec637a664
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://asupuro.com/user_data/image/file/kabafagotoxesorijeviwak.pdf In PDF document text
    • https://spvi.cn/filespath/files/20210916223247.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/22170110061.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/kubulifavubaloj.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/debik.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/30442972047.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/37cf4786acd14f84dbf99db859096011/kurunevokulowafilukezomu.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210919163038.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/89647007632.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/kafogiva.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/momisi.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/tukofojaforipepafek.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/leken.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/tagotekipodexamujadok.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202109150845047852.pdfIn PDF document text
    • http://devveb.net/userfiles/file/lagowesukesawibadonod.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/wodivanunotejeg.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/rulopevukazikuwuri.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/nalaf.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/muriboxefiketonesagi.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/75825412387.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/demakaz.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/84606811024.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/2d3409b36fdaa654775924132fa18424/41076748059.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/gosowipelikogebo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=pixel+art+color+by+number+mod+apkPDF 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_off0000db24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF336 17736 bytes
SHA-256: 3b5ccaf853b21bd3ba9aa0cbec1dd3bd02d740e056d61fa27951e7a5cc778254
font_02_sfnt_off00012122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12122 11056 bytes
SHA-256: 38a83ebee069e09c8715991aa3643a692f6569e3ba4c4eb87bef10e1197cda41

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