Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab010bd1e1b09e7d…

MALICIOUS

PDF

86.3 KB Created: 2021-09-10 17:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f9c3a322a15d1143067e55866199ec20 SHA-1: 1699246f68cfa75b675810dbbe868239acfc2ee8 SHA-256: ab010bd1e1b09e7ddab726f3e94d5a6f0e62f94907fb054d05f1e7da563e47be
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The primary heuristic indicates these links are likely used to redirect users to malicious content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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=shadow+fight+2+unlimited+everything+download PDF link annotation
    • http://www.heatandgas.com/EditorImages/file/49753760923.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/2109050752280740283drlv4.pdfIn PDF document text
    • http://cjpharmtech.com/upload/files/mojugojumozuwalapaxexig.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/jegulofuzafujel.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/mafukesesawofaxozarogeki.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/70239810049.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/53053375643.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/23641722675.pdfIn PDF document text
    • http://101balkon.ru/upload/files/96370462560.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/16386223718.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5b0a46bcb---52863174437.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/29772350773.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/paridaw.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/75393749697.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/gogogof.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/datosikilu.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/xujixiziso.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/11199289474.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/kovojex.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/78388087195.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/hnjj3ppn529r5j321vrdo2emm4/gijipogezabexob.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210908070756_kgnk64.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/10189360405.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C1 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_02_sfnt_off0000dfb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB9 23640 bytes
SHA-256: f67998a5dc20eee0d3b461b590a2be8a3803484e3e70147190a6755ecafe9788
font_03_sfnt_off00011a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A36 16320 bytes
SHA-256: e0f4260fbb79f64d4308a44ae884429353002bdca24fb6a55820f2b247444149
font_04_sfnt_off0001308c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1308C 11192 bytes
SHA-256: 8110477541a45dd1f4a96c8cc8ba61250de550096df1197302e6255afb4cf07a