Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfc31568dd6c7fcb…

MALICIOUS

PDF

80.3 KB Created: 2021-09-18 02:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b0f48ed06dcc4abcd26390e3d8a0c231 SHA-1: bf1e16e9831f7c973444389d3c7dcb4ebd0ac8ec SHA-256: bfc31568dd6c7fcb687b27951688a75e503adde1d89a27c8b533d48cdbead7fa
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it's designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to its use in exploiting PDF vulnerabilities or delivering malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://stsmcc.org/www/js/ckfinder/userfiles/files/movupizororozimit.pdf In PDF document text
    • http://agataklimowska.pl/userfiles/file/nusazefepex.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/zutugebepopajiwogivilugeb.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/94232784414.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407f921198d---xibaliza.pdfIn PDF document text
    • http://edbiji.com/uploads/files/20210918072306_725168.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/zurapud.pdfIn PDF document text
    • http://synfarm.com/upload/files/27248713995.pdfIn PDF document text
    • https://thietbigas.net/media/files/fosoxojaf.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/64083052323.pdfIn PDF document text
    • https://polandpools.com/contents/files/41634645117.pdfIn PDF document text
    • https://anaksemut.com/contents/files/benorusomof.pdfIn PDF document text
    • http://zerosquareonline.com/file/gebanavewokepus.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/tafigoworafigorowagetom.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/e8c6bee52a7d1ea646f1880dbbee895f/44939580916.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/xalarigijovorewujimu.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1630525762.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/gipojopuvekajuwubelizol.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/87621924560.pdfIn PDF document text
    • http://www.bash.cl/media/file/duduwofuvuzumut.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/17156847015.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/nerotixajaselepogutaxire.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/57334584450.pdfIn PDF document text
    • http://specialcats.nl/media/files/22863018803.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=check+firmware+version+androidPDF 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_off0000d5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B5 10872 bytes
SHA-256: da87e2c30da01a566244669cafd69463712afbe71ac14911fbc9fc8593d4ea53
font_01_sfnt_off0000eebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBF 17068 bytes
SHA-256: e3e95a2b06209b3f1ebdcc94292c547b64a9cc50a80835290519dd172ca88834
font_02_sfnt_off00011b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.