Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd580d3cb98402bd…

MALICIOUS

PDF

66.9 KB Created: 2021-09-12 03:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 8b3f2ce1923b7f943ebeef9938d64c20 SHA-1: e33ccc3706c792d51b1153bd74070ca5236e871b SHA-256: cd580d3cb98402bd754044ce26d64f5e9ff277f766f964a94b4957514c153c27
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 66 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://medvor.ru/uplcv?utm_term=terraria+download+android+free PDF link annotation
    • http://gianphoiduyloimodel.com/Images_upload/files/bajomerorupo.pdfIn PDF document text
    • http://logicamail.it/draft/media/wulew.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/mafetupexokimudusaki.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/91908554338.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/91624606610.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/99121207116.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/kawumilavulawafel.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613284f88a3d5---diwoj.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109080223464828.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/gikevog.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/94865997890.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/71546488263.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210906_084411.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109092226541938.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/70278424427.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/52027387632.pdfIn PDF document text
    • http://hk-keber.de/images/file/70007987127.pdfIn PDF document text
    • http://kite-surf.sk/files/94815182945.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/wopawupekaboj.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/kozejudowo.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/wefiwitutiga.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/wajoxunevexusoketat.pdfIn PDF document text
    • 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_off0000ac95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC95 14036 bytes
SHA-256: 3f652c09a74a859449afda9bffeff182ccdf663f052b9c60729fad06bbee0422
font_01_sfnt_off0000cf78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF78 10128 bytes
SHA-256: 869a674c0f8b9847d95131e7d77459754c2f048f1758990b874d654c5498ea57
font_02_sfnt_off0000e632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE632 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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