Malicious PDF — malware analysis report

Static analysis result for SHA-256 21110fd12538af2f…

MALICIOUS

PDF

76.4 KB Created: 2021-09-30 10:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: c5a3732ab7cbe4bd0fde59d338c7589f SHA-1: 0522af64f6adba98b855a9afc8ed10aa565ee383 SHA-256: 21110fd12538af2f9a1433e17cd4d305a63b7f2377a4d405891b940fc9a4ac0c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded URLs, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further malware or phishing for credentials. No scripts were extracted, but the structure and URL distribution are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://catamma.ru/uplcv?utm_term=open+ods+android PDF link annotation
    • https://rts-wm.com/ckfinder/userfiles/files/rejigimizememewazamed.pdfIn PDF document text
    • http://trieuduong.com/images/Download/96393126351.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/6p4lfe66isf188653l33mkob66/13956701701.pdfIn PDF document text
    • http://zimmerei-possert.at/pugujikef.pdfIn PDF document text
    • https://inks.bg/userfiles/file/sibaguwutexeleburulut.pdfIn PDF document text
    • http://0048.pl/48files/file/pagujafoduwagalax.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/xovezokalevanaxixoz.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/77567138524.pdfIn PDF document text
    • http://fruitvita.com/files/files/14666255617.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/faguwavipevadep.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/godubijeketiwewolanowiku.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/40635964227.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/navegofakepoxor.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/nilerajovewit.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/xiredunebe.pdfIn PDF document text
    • http://tecksco.com/upload/files/pijotuboziputaguf.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/rojub.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/minudufizeledasu.pdfIn PDF document text
    • http://cserepakciok.hu/xdata/file/vuwozovo.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/tuvuvomedaji.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/fugokanit.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/9065329650.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/bozukobusanexasup.pdfIn PDF document text
    • 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_off0000c135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC135 19976 bytes
SHA-256: 24adb0b346afb6526f0aeda6dc50a2b76f24a5574417478eb3c764ebaf0bdeaa
font_01_sfnt_off0000f4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F2 10268 bytes
SHA-256: c81f2209e55f8e75097a5668eba6e05a880e497809385708dcce9e89ee4927eb
font_02_sfnt_off00010c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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