Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f9533580e2ffdff…

MALICIOUS

PDF

81.3 KB Created: 2021-09-12 12:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9b3d934b7521061e3fefb8f0418fcb7e SHA-1: fedfcea912894c196f181a617ae65c7471055918 SHA-256: 6f9533580e2ffdffd2713e39a1386e9b687e4157e67d2ff52433702121bea6f1
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple embedded URLs point to potentially malicious or unknown domains, suggesting an attempt to redirect users to harmful content. The PDF structure and embedded links are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://tfe-design.dk/userfiles/file/jetimizogikapumepeloxer.pdf In PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/masufanov.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/90920967345.pdfIn PDF document text
    • https://filetorme.com/upload/files/xojuzas.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/xogizijetizitaligova.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0950e5460---32994253854.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/guninixumodejobezot.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109030757349124.pdfIn PDF document text
    • http://lejonhund.com/upload/63016142576.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/zaginedevepizu.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/43715723094.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/rivetabiviravejeb.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/97388171948.pdfIn PDF document text
    • https://ms01bet.com/contents/files/gaxim.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090305433973499.pdfIn PDF document text
    • http://daiichihousing.net/uploads/news_file/14907952624.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/xagiwupen.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/51118121688.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/kolov.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/63101215305.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210909013509.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/najumoxomarokatez.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/vazabufadimosinosedezupak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=scanner+in+play+storePDF 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_off0000d909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD909 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11B 17836 bytes
SHA-256: de0dcbd5b03697da738aa44d0869584fcf4c8ec787594ae3867c76dc51c9edf5
font_02_sfnt_off00011f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F49 10556 bytes
SHA-256: 109765f21e78a0d9014504dca4ea87c1b64e91d7ffeef16bc29806630bf1b239

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