Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c2b3a82a1bb1df…

MALICIOUS

PDF

85.7 KB Created: 2021-03-20 10:43:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 9dca5603128c5d633a5cdee35bac9020 SHA-1: 1e3a495a0543a23a6daf39f9b57e78800fad4cc7 SHA-256: b7c2b3a82a1bb1df588f316811a5023723cbe03654569adfa0b5c17277be618a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://seumenha.ru/award?keyword=time+saver+standards+architectural+design+pdf PDF link annotation
    • https://cdn.sqhk.co/reriwoduriju/gijdopx/zujubafasen.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422908/normal_5fdd02e315d7d.pdfIn PDF document text
    • http://pakekoramiduwin.getenjoyment.net/kakuraromuxagalumevola.pdfIn PDF document text
    • http://sedisifoxe.22web.org/nimemiwivu.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvopone/66Mhd7X/cricket_bowling_green_florida.pdfIn PDF document text
    • http://mevukavotidu.getenjoyment.net/evenflo_exersaucer_triple_fun_entertainer.pdfIn PDF document text
    • http://tonukavugu.mygamesonline.org/how_to_clean_honeywell_hcm-750.pdfIn PDF document text
    • http://wixosefimaba.scienceontheweb.net/sorry_seems_to_be_the_hardest_word_chords.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426088/normal_5ff91c27d1df7.pdfIn PDF document text
    • http://kuboduzuke.mypressonline.com/nordic_male_names_for_dogs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474448/normal_5fda777f58649.pdfIn PDF document text
    • http://fafasun.iblogger.org/internal_audit_report_executive_summary_template.pdfIn PDF document text
    • https://cdn.sqhk.co/zotipimesaza/yjcjjLR/bein_connect_uk_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471688/normal_5fcbd8bbf05d0.pdfIn PDF document text
    • http://gopagafab.medianewsonline.com/beatus_ille_horacio.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://guberiwexoza.rf.gd/bogan_tamil_movie_1080p_video_songs.pdfIn PDF document text
    • http://zonavopom.rf.gd/kubizefuwiponumuke.pdfIn PDF document text
    • http://pakuvoxaje.epizy.com/5370194815.pdfIn PDF document text
    • http://mosaxigegikoza.rf.gd/what_was_the_insular_cases.pdfIn PDF document text
    • http://jigisasamupor.onlinewebshop.net/laporan_kasus_bronkopneumonia.pdfIn PDF document text
    • http://jimomurapujivo.onlinewebshop.net/why_is_lean_management_important.pdfIn PDF document text
    • http://jatomije.rf.gd/bypass_unlock_icloud_activation_lock_tool.pdfIn PDF document text
    • http://nupabumafe.epizy.com/christmas_certificate_templates.pdfIn PDF document text
    • http://mugavividuroka.rf.gd/85743985044.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://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B5 5580 bytes
SHA-256: c25dde00a802777c06576e7785b1cd4e8ff801cec6599f03f7694046005249c4
font_01_sfnt_off0000fa82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA82 6728 bytes
SHA-256: 371ca6a5c9d4c96bef02b8611d5568cc17910da7f18913c8f86ccacab669b858
font_02_sfnt_off00010c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8A 10848 bytes
SHA-256: ea23f0937deb515f5e4b1e3b852f2540a59e7b54c1fbfcadb042ec8d1cbe7f69
font_03_sfnt_off000131e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E0 16452 bytes
SHA-256: 063aa5fbeb95941b4c41de8821c732977c1774be542c6e5e33e3f8bd24aaca51