Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d55d20791573b7a…

MALICIOUS

PDF

84.4 KB Created: 2021-09-17 10:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 90829a6676a8b9741cc14a1aef7ef4f1 SHA-1: c294bd0e3d9913d3aa81f5a6eecf69d52d73f112 SHA-256: 2d55d20791573b7af8f2c1a4474be50942105605444dda7bbc4692f1497edb11
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm on disposable hosting, and multiple unknown URLs were extracted, suggesting a phishing or malware distribution attempt. No scripts were extracted from this sample, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://akemi.ro/hirek/file/karokak.pdf In PDF document text
    • https://protradingindia.net/userfiles/file/62342429109.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/18454108705.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/zupozonafafef.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/xazopamipinodabized.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/71080964183.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/9befc1879876a7438dcc6ddf8dd5a2cc/keporezokabe.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/80394845459.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/vuxivirawedamodugevuposud.pdfIn PDF document text
    • http://efeteknikyapi.com/userfiles/files/komaweruxekizububot.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/wofaxajupokidodiwuvadabom.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/xikesuvupefusejidusugam.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/kageboxerexirovu.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/gosorezume.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/29011687922.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/mebuzabapekaguze.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/19326580319.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/penuxuxavegusawuwu.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/23062561473.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/53837616046.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/19144517477.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/64952636893.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=hack+rules+of+survival+androidPDF 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_off0000e1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F6 10620 bytes
SHA-256: ce26495f04c145de62c5970af1c219ea228c7814c6d95ae4296e57416edb978d
font_01_sfnt_off0000fa50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA50 19252 bytes
SHA-256: 7eb6105ca98185af9e6fb47d8d73f2c7a50592b55cd287eb6f3bf5a75aaff937
font_02_sfnt_off00012c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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