Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea7ceacb1eaf4b8…

MALICIOUS

PDF

71.3 KB Created: 2021-09-15 23:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ab01a995a4ccaa343b04272e4a5b3cfd SHA-1: acf5a6f45df5089f43466ffe766ba8d01f444edf SHA-256: 4ea7ceacb1eaf4b82443a049b30f4c852553ed7af86214c0be2fe43e62929aab
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many pointing to disposable domains and forming a link farm, suggests a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pcccmiennam.com/media/ftp/file/kowagodejugowuzi.pdf In PDF document text
    • http://ltpbetel.ro/userfiles/file/7165818347.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/koteforufemogukexojezala.pdfIn PDF document text
    • https://soechi.com/userfiles/file/pepidotupazunuju.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/wepibumopaxetipe.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/51279788687.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090608015851.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/4d6cd9f52b3d39d225de56af606d62bf/tamukosudurofijaxipizirup.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/pomalopimewobafe.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408d60a9974---zubuwulajezasiko.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/gubolekufifaxana.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/jutafefamatelesazepupix.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/kepakenanenar.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/tofotozosakoneboj.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/2807751249.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/79206930105.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/65208815633.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/zorogumem.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/44517808756.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/95587582334.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/terotuvug.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/kotemaloripariwaji.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/jutitaxaretebaze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=pokemon+stadium+romPDF 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_off0000b3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD0 10556 bytes
SHA-256: ebc620c77811b034fb6434047fd226d4f093c44ddcaf14dca57ad24f787307f1
font_02_sfnt_off0000e3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E2 17816 bytes
SHA-256: dfb937ec5a609b495ef436a471f4bd6ef353f40dbf27d9f1d906b26661a01a1b

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