Malicious PDF — malware analysis report

Static analysis result for SHA-256 44cf7bb4f4ec2bbd…

MALICIOUS

PDF

80.6 KB Created: 2021-09-11 13:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 16255b7d507f69c1a7257bf515c2a581 SHA-1: d4618fe244f0ee87a5f374798746fd945cbdbb8e SHA-256: 44cf7bb4f4ec2bbd4e80f28525ebc9d1cc057b18d98adc6fa3ab15b1395a0077
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic analysis revealed the document functions as a link farm, embedding numerous URLs that likely lead to phishing sites or malware downloads. No scripts were extracted, but the PDF structure itself is used to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://tdvvietnam.vn/webroot/img/files/terofolajawetapevixikodip.pdf In PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3d1c681fd---muxenofadedenipekif.pdfIn PDF document text
    • https://premium-house.uz/images/file/63355407681.pdfIn PDF document text
    • http://ty-int.com/files/files/raxatupafefiwowiga.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/c8c57c0fef6b5a20a0da520c85d67f4d/dafapazawizejurunit.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/bazarebewozefogemuwat.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/vasuxixedomawokumabaled.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/tafufujixoziva.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/luvutoritisamalidixa.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/30262715631.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/latudom.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/likiginaludivuwekeduxem.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/rivosilovojelafusuluduj.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/demulifizes.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/wukipadomokelaxuvogigebu.pdfIn PDF document text
    • http://narzedziascierne.eu/Upload/file/joxun.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/gukor.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/gupuborukexijufufiruwa.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/xikezerejivitugesebu.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/7852589630.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/66507907088.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/9487703238.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/54722334483.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/mipifus.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/gisoxajopirezituwuruti.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/nabanutin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=tower+mod+apkPDF 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_off0000db43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF355 16580 bytes
SHA-256: 67d7700e147ec0417db80a7116a4790d9c6538802466bbdd524030be3b5b606e
font_02_sfnt_off00011e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E35 10188 bytes
SHA-256: 422b5f06f82bf38ef503b4c2bfdd143fc8fe6465b5e31b51fdc9a9a50fb979c7