Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e87e63003fe8f40…

MALICIOUS

PDF

85.0 KB Created: 2021-09-21 01:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4a375ee14135cc0f9c4aa7d668ae0df8 SHA-1: 5767a0ed68476704b106de5499575e991e4927a1 SHA-256: 0e87e63003fe8f408d706f6e75c94f398e2e87ce6636656e5d8f5d8660488834
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically noted as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=wr3d+svr+2k17+mod+apk+download PDF link annotation
    • http://braciszewska-klimek.pl/fck_files/file/sirikoxufibugamalar.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/25767213145.pdfIn PDF document text
    • http://finance-bulldog.cz/UserFiles/File/97775968919.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/sagewizoxerifo.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/81657332828.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/99106244481.pdfIn PDF document text
    • http://canvangdientu.com/images/file/magetatitifusosobubago.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/49202253197.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/rufeginotoguzix.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/89587795597.pdfIn PDF document text
    • http://nemochem.cn/upload/files/22847677226.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/lewoledeliziratasojedagep.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/27565581308.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/25153992773.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/binatolevozuselutadusil.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/50921377119.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/lovewedufelowofux.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139022b9c62a---borowebeweniteberasoj.pdfIn PDF document text
    • https://investkwik.com/userfiles/file/81977053637.pdfIn PDF document text
    • http://baove247.org/upload/files/51878220798.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/fu60ulsbgkvm0bdgjm5tqu369g/40756058731.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/namolorabewazusune.pdfIn PDF document text
    • http://areopag-group.ru/sites/default/files/uploads/4083752803.pdfIn PDF document text
    • https://avukatwebsitesi.cicasoft.com/upload/files/51210972810.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_off0000e760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE760 10860 bytes
SHA-256: 97af31cfe0e7c48e2ec95a2d7f0a2d1f17597904429fd0c5e34b83820f43dd9e
font_01_sfnt_off000100a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A1 17400 bytes
SHA-256: cc88e92ab53516893550b2a24780fe2c28467a448482c8105fc651732a61d7a2
font_02_sfnt_off00012de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1