Malicious PDF — malware analysis report

Static analysis result for SHA-256 e604601d2914fc9b…

MALICIOUS

PDF

85.8 KB Created: 2021-09-08 19:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 576237b23064a77067c8b508260bb88a SHA-1: 9a71bd4d12c0dd9f0a082ff9d39c52f58144c2a6 SHA-256: e604601d2914fc9b7936bbfb57ef1474ae35d1062c0cebc790411b29b70d01f5
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous embedded URLs pointing to PDF files hosted on various domains, suggesting a phishing or SEO manipulation scheme. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to distribute further content or lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://phuquiland.com/upload/files/xiwaluxirozizojegutedep.pdf In PDF document text
    • http://leeharringtonhomes.com/userfiles/file/kafukawovagavisowoleluro.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/21570713327.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/55254425365.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/58366450129.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/jarutapuzubawa.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/wupakulapek.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/nekalabaxorotavovivepexal.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/gesili.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/30138154408.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/dadoxomavolu.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-5/20210905033213743564.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/ba766e7ebca6d2beb509aaef0f303daf/kimawix.pdfIn PDF document text
    • http://tid.vn/upload/files/gigekevemapezis.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/sozivotexogibe.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/4415455067.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/damotevasowegiwa.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/2320220356.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/melukusul.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ac1464c27---51996670077.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/20945672686.pdfIn PDF document text
    • http://chinalabware.es/d/files/7370563665.pdfIn PDF document text
    • http://silver1979.com/upload/file/56927794165.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/barirumajirami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=metrel+mi+3102+eurotest+xe+manualPDF 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_off0000e47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8C 19664 bytes
SHA-256: de2b35f7e8ee8bac5ca61fcc16ee79810c99e7afebb55257e3e3d4c27d21e8e9
font_02_sfnt_off00013007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13007 10928 bytes
SHA-256: 3bb5ba1c9bf5f424f76445b3dc31463895fa3e5ff6939b22b98b0186e4ed3521