Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c65e42565cec4f…

MALICIOUS

PDF

70.6 KB Created: 2021-09-26 05:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eb958c0ba82f8aec1f8d2c1477b81e4b SHA-1: e4363dff4736a5246b06013f7b9f23be76c50f0c SHA-256: b4c65e42565cec4fb683437f354a0e9810ae3b85fc78b2cae57852a8c505f988
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://myapartment.de/web/editor/files/gupajosasafalemuwilifup.pdf In PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/21562657308.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/lesezuwof.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/79843377386.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/vukujanulebokas.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133716a000b9---78645252236.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/segeg.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/sefop.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/472356294.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/fipukopewofora.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/loropobov.pdfIn PDF document text
    • http://n-zvuk.ru/upload/file/46656433201.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vewepajosixafovasesiloro.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/tubomonigifijixu.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/bibowixobogabovinewu.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/23577797063.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/76128404944.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/97713525365.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210906135351-71155302501.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fbe9ee459a---61146771600.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/tezer.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/45743361684.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/57069008875.pdfIn PDF document text
    • http://sbcnepal.com/images/file/21644286209.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=android+1+nba+2k14PDF 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_off0000b36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36E 10260 bytes
SHA-256: 1a28925963a12ca345ab75c1e7421fb635eae72f72382c92464ff48f51d6eb54
font_01_sfnt_off0000caac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAC 16640 bytes
SHA-256: f69933e383157081429a5f22d3165fcd31b2e9b4fe24cbb6689e8a8815f1e3cb
font_02_sfnt_off0000f4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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