Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd8e17d251b48e1c…

MALICIOUS

PDF

69.8 KB Created: 2021-10-01 13:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e74f03ef3e4823f061844920bee56cb4 SHA-1: 8b3d62ac7bd6e04d2deca502ce50b314b955e29f SHA-256: bd8e17d251b48e1c2a728410cb9972bde09c97a660ab28ceb52488f73ca0d107
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting. The presence of JavaScript points to potential execution of malicious code within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://marcth.pl/media/fck/file/poxojalasuzozifuxiru.pdf In PDF document text
    • http://abaj.cz/UserFiles/File/91401601865.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/suduzi.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/56540359759.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/79742322469.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/pugafanuvinatefo.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/xezowuruvanuti.pdfIn PDF document text
    • https://cowik.pl/upload/48056390237.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/lewanodimagu.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161432fd75a685---68026014217.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210929_035924.pdfIn PDF document text
    • http://qdcmd.com/data/files/8210232945.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/10286322528.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/gomuxovofuw.pdfIn macro / runtime command snippet
    • https://nobelboya.com/userfiles/file/90915984822.pdfIn macro / runtime command snippet
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/busoxupeteluva.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/48533599225.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/18630773350.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/jefixesirojarubedoxepi.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/mapixuvezegavitonefajap.pdfIn PDF document text
    • https://maurinet.com/userfiles/file/guxijesexemiwixep.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/jepenitekuforumib.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/57662681445.pdfIn PDF document text
    • https://kueapem.com/contents/files/madojivosi.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/87ddce43366e80566c067bd3d5bcdc47/97099743641.pdfIn PDF document text
    • http://dichvutot99.com/webIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=final+fantasy+3+nes+mapPDF 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_off0000b2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC3 15132 bytes
SHA-256: e6c02d6ff9ba239acd237755c34c5b99cf2eb72920bac91b26b9a380933b194b
font_02_sfnt_off0000f10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10A 10560 bytes
SHA-256: 805669b96085590e220b0763f1cc58750fdfe34a853b56caa426133320a96383

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