Malicious PDF — malware analysis report

Static analysis result for SHA-256 5356b470bc3169ba…

MALICIOUS

PDF

80.2 KB Created: 2021-04-09 03:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ef8c4dd8b3063c6bbfcbc2346f5f1d80 SHA-1: 2eb28ddfb42130421bf856dc47d3165cfc6f5bd5 SHA-256: 5356b470bc3169ba1c392c09c8092e24afc17a3a4a930b209c97270fc82e7cff
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links pointing to disposable domains, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://gimoguvi.ru/strik?utm_term=the+holy+quran+english+translation+free+download PDF link annotation
    • http://gulebamabixaku.22web.org/71780513095.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369915/normal_605a0ee7f2729.pdfIn PDF document text
    • http://nowtorrentz.com/nexus_mods_fallout_4_modsmw4h8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456132/normal_60513582508c2.pdfIn PDF document text
    • http://wutopezogegusi.getenjoyment.net/16732008534.pdfIn PDF document text
    • http://midebozizigod.iblogger.org/adobe_photoshop_shortcuts_mac.pdfIn PDF document text
    • http://gifudevuf.iblogger.org/49597492569.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469349/normal_600ba5f0b325a.pdfIn PDF document text
    • http://bamefidev.mygamesonline.org/korasotopajeduruw.pdfIn PDF document text
    • http://edevletorg.com/79765511127q1i44.pdfIn PDF document text
    • http://gusevoxuzuwelap.mywebcommunity.org/zedogonufesozug.pdfIn PDF document text
    • http://modebedunizux.iblogger.org/beferabibasekuvenuxus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369160/normal_6027d8cc8dd52.pdfIn PDF document text
    • http://edevletorg.com/69627908617ne3sm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365634/normal_6046b80be9895.pdfIn PDF document text
    • http://my-favshopd.online/vubolovaxofamuked2pdfv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vigukesege.epizy.com/happy_birthday_cake_hd_pictures.pdfIn PDF document text
    • http://kidaxuv.epizy.com/escape_plan_board_game_rules.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/o_b_c_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/kajinatagiwikazewimad.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/excel_basic_formulas_with_example_2007.pdfIn PDF document text
    • http://gigolovumiguse.rf.gd/109836361.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/automation_vs_manual_testing_ppt.pdfIn PDF document text
    • http://rovafitazilom.epizy.com/best_music_reader_for_windows_10.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB73 5436 bytes
SHA-256: 5759fb126e5e18b665c2f9abcbaab843a1f1e93dc1ec6fe1163696bb66096249
font_01_sfnt_off00010df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF9 11020 bytes
SHA-256: 7b838ab272a049f8b12af5303c58521bab626729fba9164ef6edf9692da5d8a5

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