Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff86d283881ab05b…

MALICIOUS

PDF

71.7 KB Created: 2021-09-11 21:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b8fa8fd1681e78de2aa0cddacc248994 SHA-1: 87534c0d71b02d2bd2a635eb26611899d643c48c SHA-256: ff86d283881ab05be66221c36c51364c619614876f8a4291c7c1b2e6086c1d72
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to suspicious PDF files, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure malicious destinations. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://delannahotel.com/user_img/file/75447457844.pdf In PDF document text
    • http://eminenceinc.com/userfiles/file/kusijezuzumo.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/bizikir.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/sebogonepotitutijoxafav.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/mevorafaf.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/75334992391.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109101955051558.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/pewifovomidab.pdfIn PDF document text
    • http://haki.vn/uploads/files/34319872657.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/tarutugegavatabobisuwusow.pdfIn PDF document text
    • http://proxima-design.cz/files/file/26410315969.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed619d128d---41692764829.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/11542668336.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/17133445576.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/34690381059.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/sadumibikojeju.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/pikav.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/36288336521.pdfIn PDF document text
    • http://hotechike.com/files/files/kinubirot.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/2695c7bd4b92bbf5b40919d0cb2a5cd6/sajubenigiferupotoresek.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/zarajavozavugekilikujodo.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/4957588503.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=tom+%26+jerry+2021+full+moviePDF 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_off0000b8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D8 9324 bytes
SHA-256: 0435703591555079fd1e345d5a2cbd37c969bd88d57a9d9c4009dd4fe7cf6bd7
font_01_sfnt_off0000cc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7A 17648 bytes
SHA-256: e68c7c9bf27e81f60763c5d0e51627f11d5f09f2c1c3099bc66fcde234951bec
font_02_sfnt_off0000f9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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