Malicious PDF — malware analysis report

Static analysis result for SHA-256 e45f152ee0b76739…

MALICIOUS

PDF

76.1 KB Created: 2021-10-05 18:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 087b289e289ea19910d4af2ea344cc7d SHA-1: 83cf522a304898002b08bc25ee65de34a2f1fc09 SHA-256: e45f152ee0b76739a11b57282f98976cd59f4e6dc35c5f494a88f204d7846008
126 Risk Score

Malware Insights

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

The file is a PDF document flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many pointing to domains that appear to be part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The primary purpose seems to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://cristalensi.com/public/File/61255136726.pdf In PDF document text
    • http://sinching.com/uploadpic/files/202109110446188478.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/belowoxukaka.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/236481ef790e795cab4f6a7951eec86c/baligaxukogifawijel.pdfIn PDF document text
    • https://armenia4d.com/contents/files/lonugasisizegejobaxajus.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/19647775762.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/87768654472.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/69153135002.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/mawobedokef.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/zetur.pdfIn PDF document text
    • https://es88.tw/pro_pic/files/xekozefodowitif.pdfIn PDF document text
    • http://surausa.com/uploads/files/tuzuvugilega.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/83251471694.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/74064701293.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/64904571230.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/23243425081.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/sivolakanuba.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/nitomakolanogevabanafutej.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/2797330647.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202110010431461164.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/babinuvovaliza.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d18b0a2e9e---43312388804.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/45209807900.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///66896086172.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/84708387649.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/siragaferiwewa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=tiger+striped+mustang+locationPDF 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_off0000c39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC39E 10920 bytes
SHA-256: c85cfcd52cee8d905c98fb2783a2af0ef033699e78b0d798cdc36cf0873bbfe9
font_01_sfnt_off0000dcae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C0 17544 bytes
SHA-256: 6152a9619df232dfc5f00d382516e13494ba4f7ac73376b5e1b2ffb75a9e89d2