Malicious PDF — malware analysis report

Static analysis result for SHA-256 51c4b914c556d0fa…

MALICIOUS

PDF

79.5 KB Created: 2021-09-17 13:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1676338b00110d4867a74e22621d2095 SHA-1: 5b09081afbef391626697fff19eea07e83399a64 SHA-256: 51c4b914c556d0fad6cd56462c4ae6d8b91d272e6524209dcdbe292c6dc40789
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm with numerous embedded URLs. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high likelihood of malicious intent, likely to redirect users to phishing or malware download sites. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://alles-vom-schreiner.de/userfiles/file/pijan.pdf In PDF document text
    • http://we-women.de/default/files/uploads/file/66532019475.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/fixutikonepirefudiliwizi.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/dowab.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/65094516612.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/minunor.pdfIn PDF document text
    • http://atsolution.org/userfiles/file/20210909072153683758545.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/93954629282.pdfIn PDF document text
    • http://ellev.fr/upload/files/68420675634.pdfIn PDF document text
    • http://akademibt.com/resimler/files/dexipifimebexegekedisej.pdfIn PDF document text
    • http://climtech.com/files/files/runupiwikatele.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/fakokubumifubolawepejodu.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/xikipi.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/dajuzevogelini.pdfIn PDF document text
    • https://tdfstore.it/file/gadijazuv.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/kavemawakavolunu.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210912062328018595595fob08covw.pdfIn PDF document text
    • http://ausafe.net/images/art/files/pepagarodinazisinom.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/93952896198.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/jomofufoniduzeliwepisak.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16138dfc705608---87789146858.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/sevogesatinugu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=shadow+fight+2+special+edition+max+level+mod+apk+downloadPDF 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_off0000caa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BA 19408 bytes
SHA-256: 0c854db25a6843e9e7c5f7a167c0c577a23a72e3084900e35ad9d05e112ec1bd
font_02_sfnt_off00011540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11540 11508 bytes
SHA-256: 27817e806140c1caa3e26a62aa934ff2855a89f09f1f97213cbe3c10ede607e7

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