Malicious PDF — malware analysis report

Static analysis result for SHA-256 d390ae1ff2df9d98…

MALICIOUS

PDF

109.1 KB Created: 2021-09-16 12:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0dc330ad3b2d98bd229786dbe71e2a8b SHA-1: ec0bfafa89e29a989c617192171559edceeadd18 SHA-256: d390ae1ff2df9d98a320210a6d1996c2a5bf6e7111dbc155b5e61643d5be0374
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing campaign. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://garglob.ru/uplcv?utm_term=best+sweaty+combos+fortnite PDF link annotation
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19245685873.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/35103011357.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/kununapelosamudotorelori.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613172218f2da---dojonovepepijasuzipapej.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/27602349902.pdfIn PDF document text
    • https://actorconseil.com/files/file/95513324226.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/mopebodekanexinagilemirim.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/16568971141.pdfIn PDF document text
    • http://thegioioto.store/upload/files/gogovulefixubabul.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/zubixuxedenulamazugama.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/48970090361.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/68577675278.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/giloxikanodegibovisizuf.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/30678172328.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/39159567660.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c37aa44d7b---dulax.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/8310271443.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/86190164550.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///toditofegivejasebopavaboz.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/bojogi.pdfIn PDF document text
    • https://istanajp.net/contents/files/66039086918.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/pogegul.pdfIn PDF document text
    • https://pellevah.com/upload/files/35232205377.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/62915220191.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/zivarujarirabatobawowob.pdfIn PDF document text
    • http://apothepharma.com/upload/files/47662335292.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_off00014408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14408 10844 bytes
SHA-256: 375fc6d7884d3cc37721502f4d88224f5ba3ffa5fb942ed8e2c4441c412eb042
font_01_sfnt_off00015d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D35 18844 bytes
SHA-256: 25a5deec61b40069c6f91807ad6eb583e456a9ebb7596b3bfd980f0d8789dc99
font_02_sfnt_off00018e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1