Malicious PDF — malware analysis report

Static analysis result for SHA-256 0245ed012804b5b8…

MALICIOUS

PDF

86.7 KB Created: 2021-09-18 06:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 26e16f88a7b4c71536bb10f54023f684 SHA-1: 20d484de26364d6cbd741c3539fc68a1129c099f SHA-256: 0245ed012804b5b8b8c9a212324008230c087298c7f45382172a09cf8fa1a35e
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on disposable domains, indicating a link farm designed to obscure the true malicious destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pankajplast.com/ckfinder/userfiles/files/zipigijew.pdf In PDF document text
    • http://unionasset.net/file_upload/spaw_upload/file/20210902075720.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/vovidujexuzekutajej.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613820accc76a---nununudefogorab.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/jimaxufe.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210903_173F6E2F961B32B9.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/74133394837.pdfIn PDF document text
    • https://attack.lt/images/files/27526003578.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/bojapizojafiw.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/55428456293.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/68477799035.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/womos.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/gasotij.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/901d46f9fddaad2925ace8a8209d89eb/76613002290.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/65624734929.pdfIn PDF document text
    • http://hzdsbg.cn/uploadfile/1631245999.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/bapiwilulujurug.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/2008288402.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/53668700524.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/53092731196.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/98347029348.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/3708434149.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/36266046924.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/filozezeripedibakive.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///31045936773.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/fawuvafevewot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=shoulder+blade+muscle+diagramPDF 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_off0000ee72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE72 17704 bytes
SHA-256: 9a026f35787157a4ced5f443800f116eaf33054938446912f7ed99ddfcf9506e
font_01_sfnt_off00011bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF5 10928 bytes
SHA-256: fc14f06faa110888fa988d8791b1654b067a7a59c643394df4562896d25cc0e2
font_02_sfnt_off00013507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13507 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1