Malicious PDF — malware analysis report

Static analysis result for SHA-256 3213675dd8ec442c…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 10:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d46022a53239076590ba17b580d2df88 SHA-1: 1fc3f892271c150634de9a1fddebfeb8129cc420 SHA-256: 3213675dd8ec442c588f23eb864215a0879bc55df9e1c74729e0e61742162c73
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links point towards an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crysiq.ru/uplcv?utm_term=como+poner+los+botones+de+android+en+la+pantalla PDF link annotation
    • https://tsafar.ir/basefile/tsafarir/files/vavixanekuzuladuwa.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/vozifegojopigololamox.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/58493568131.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210910_F263CD2402A4025C.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/molevukoxi.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/zopupupukakega.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/piginuwejarimep.pdfIn PDF document text
    • http://budropol.de/Upload/file/91022453094.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/23457326545.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/pagugaki.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613edcc82bbdb---sedizuwoxun.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/35991036345.pdfIn PDF document text
    • http://www.polni.si/Images/files/wizakavujijotozutefimur.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/69841638999.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/moxuxekenore.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/86946337645.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0717813ac---52862680024.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fezusuratudegov.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/35722769459.pdfIn PDF document text
    • http://meta-min.com/files/begima.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///202109082282_46322006.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_off0000d25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25A 20588 bytes
SHA-256: bd123ce0350bd9add11c6337aae1c423cd3ead6055c723dbcdd8403a0bafbd40
font_01_sfnt_off00010745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10745 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5C 10724 bytes
SHA-256: b80c25d03e61ecd3177788306991e0a9daafb080d3d4dd53d23c34360ffa0c0a

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