Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a854ce72af80db…

MALICIOUS

PDF

85.5 KB Created: 2021-09-09 14:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1634a0bfac439e3c23027cf62daa380f SHA-1: 9299a3067886b033eb01c1f58c5ec533f2a4be2c SHA-256: c4a854ce72af80db9fd99336eb73ff14d698cdf170fbc7b28638a0c33aa92d86
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a significant number of embedded links, many pointing to distinct hosts, characteristic of a link farm used for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://plymouth-logs.co.uk/ckfinder/userfiles/files/zetejatukorefiguvugolina.pdf In PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16132bed082e09---50846485871.pdfIn PDF document text
    • http://wamer.org/userfiles/file/mujupofijovafinazoraf.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/sasuwigelaj.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210908230023_9g6m24.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210909052620.pdfIn PDF document text
    • http://ciskmv.com/css/file/ponugoxasisumemutivepanow.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/paxejirepafe.pdfIn PDF document text
    • http://htygroup.com/upload/files/35459037162.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/24870152631.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fe3257202.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/43164010619.pdfIn PDF document text
    • http://minhanh.com/files/tananizipapugivupen.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/pokarigiju.pdfIn PDF document text
    • http://agro-norwa.pl/userfiles/file/31239422473.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/67067403332.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/lajedupi.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/sopuditari.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/7968534979.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/bunenela.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/bokisasosixekurixesuv.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/sokixixiwibemoxe.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/33039136619.pdfIn PDF document text
    • https://gameclub.by/uploads/files/jupoxolerazad.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/51450722162.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=esim+in+galaxy+watchPDF 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_off0000e639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE639 19532 bytes
SHA-256: 005f8f40d167f9be2ffa983b742f2c399f0ba485ef4cb0e89c4ebff1f8309e7d
font_01_sfnt_off00011855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11855 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001306c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306C 10612 bytes
SHA-256: e5ca7b7ead97260a6a4a232d0f7a5d30a3be77c1dd8097231fe9f8cc80a1aa3c