Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ebc57fcb5dab66…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 01:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a227d1eafbd05378525d9337ce441ec3 SHA-1: a4dfc3790bf4787fe17b812b1818b736b4008eb4 SHA-256: d7ebc57fcb5dab66333d7f0fa28d3e2ce7d0f1b4512cd8c2b78f3ec2f96d5a06
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to other PDF files hosted on a variety of domains, many of which are flagged as potentially malicious or unknown. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a network of links, likely for SEO manipulation or to distribute further malicious content. While no scripts were explicitly extracted, the nature of the embedded URLs and the ML classifier's high confidence score suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dabekixiziwazudumonaraw.pdf In PDF document text
    • http://xy-interior.com/uploads/files/202109170557132306.pdfIn PDF document text
    • http://candientuvibra.com/images/file/80377441307.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/marawek.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/tujiriradaxibikobowivufi.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/fepeginodafaremevir.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/56822645485.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/6430320674.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/tobarunigux.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/dezimaxidofaz.pdfIn PDF document text
    • https://nexapos.com/upload/files/95120689062.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/79205936581.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/bepusi.pdfIn PDF document text
    • http://ceroki.com/image/files/fogel.pdfIn PDF document text
    • http://builderall.info/userfiles/file/zupoto.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16143be0c70480---woredugibife.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/85323152852.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143bda95ed67---98765276539.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/99726404685.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/zudipaduvopalewak.pdfIn PDF document text
    • http://clickvay.com/upload/files/89726670898.pdfIn PDF document text
    • http://megalaserasia.com/upload///54091220519.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210904110719_960732456.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/58607420516.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/pedozufigimokegaso.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/34012362690.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=the+naked+ape+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_off0000db03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB03 18088 bytes
SHA-256: eb1ef6247073ab9beb20518e4382a15ce7eb77e1efc687c4a4ea156071a8e013
font_01_sfnt_off00010a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12291 10024 bytes
SHA-256: 275e55b2780ed07b8e49573db6a3500f2b138f0fcb5385a89a0978927410e812