Malicious PDF — malware analysis report

Static analysis result for SHA-256 084bfb15c4e43f5f…

MALICIOUS

PDF

70.5 KB Created: 2021-09-24 21:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5e4c371b6730daec0cd5e6c11255066e SHA-1: fc0e127ecb5936c0d0be7e9ac65d9aac9755cd20 SHA-256: 084bfb15c4e43f5f07aa5371024f61a45332d6df62c0003534e67b599ec0d5c1
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a specific ML classifier and ClamAV detection for a phishing trojan. The document contains numerous embedded URLs, many of which point to suspicious domains and are structured as a link farm, indicating an attempt to direct users to potentially harmful content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/bodezofemix.pdf In PDF document text
    • http://forestheightsgarden.com/ckupload/files/xebuzilunewowe.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/69303803189.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/39092181823.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/78694818171.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/95516882739.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/didizelirevadifofapo.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/supovowevevadozu.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/tabareronosigopavop.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210909094857.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/61236433491.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/pipidejekufup.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/30648640992.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/65063908892.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/sodoj.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/zuzovef.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/61015354616.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/15536062517.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613df5f3d8f5d---45257463867.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/11808798041.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/xisegetulixar.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/20219921474318.pdfIn PDF document text
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/gozaba.pdfIn PDF document text
    • https://endobible.com/userfiles/file/gezifezifudopufigarezita.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=cbse+8th+maths+textbook+pdfPDF 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_off0000b1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DE 16288 bytes
SHA-256: 58757df2b04b3d10f1e3a9b54659c913139fb7d39d4eb8dd614a287f2021baf9
font_01_sfnt_off0000dac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D8 10992 bytes
SHA-256: 5957f7246903297c2778b0d476d1743b239be45ef7e1ff5f56bc74f1ceb7f9ae