Malicious PDF — malware analysis report

Static analysis result for SHA-256 666181bd0e2dfd7d…

MALICIOUS

PDF

68.8 KB Created: 2021-03-30 22:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 79163a69e2d3022a3cc789694676bff9 SHA-1: 22b492cafce11423db1ab2a32f21fabc9b84a652 SHA-256: 666181bd0e2dfd7de01e0958b1c018623bdd7469ff1b04d95075ebd54accb098
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which point to potentially malicious domains, suggesting it's part of a link farm or phishing campaign. The document body, though heavily obfuscated, appears to be a lure related to a game guide, aiming to trick users into visiting these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=guia+dark+souls+3+powerbazinga
    • http://zirekafeti.iblogger.org/dstv_guide_supersport_channels.pdf
    • https://dimenitajobe.weebly.com/uploads/1/3/4/4/134444553/vuruvexupepurewere.pdf
    • https://xonatusapu.weebly.com/uploads/1/3/5/3/135391421/468e0b114ab7a.pdf
    • https://cdn.sqhk.co/tefulobesa/giY6Kha/pekixodiwixeje.pdf
    • https://cdn.sqhk.co/vakinebavun/Rzajfja/adding_and_subtracting_fractions_practice_sheet.pdf
    • https://cdn.sqhk.co/joxonorapa/ihjfPD4/gomolirinuj.pdf
    • https://bitoxogosem.weebly.com/uploads/1/3/4/3/134386372/515003.pdf
    • https://cdn.sqhk.co/daxerarugak/ihNlGjg/lewajemuvixaxi.pdf
    • https://cdn.sqhk.co/pelopuxi/bj40oIi/best_free_file_manager_app_for_iphone_4.pdf
    • https://cdn.sqhk.co/mupalewefe/ig5ibhi/free_app_to_draw_woodworking_plans.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gozilum/instructions_for_knex_tank.pdf
    • https://s3.amazonaws.com/xutomoxu/12438418401.pdf
    • https://2703069b-a6ff-4ff9-983c-db139a8d76ba.filesusr.com/ugd/8b61cf_8a3ac443c9ae405489232c3fba0111c7.pdf?index=true
    • https://0d3c4653-ec4b-4b04-9c20-59e348ba858e.filesusr.com/ugd/62200f_f2a83915b6b440dc8829f2813b618275.pdf?index=true
    • http://nuvupij.rf.gd/genetic_engineering_in_crop_improvement.pdf
    • https://s3.amazonaws.com/miwolezedubujoz/90000798997.pdf
    • https://s3.amazonaws.com/sebunuzu/pizunu.pdf
    • https://s3.amazonaws.com/gedexim/keurig_2.0_use.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cef1.bin
afe189fd01e8cedcb7c1ef3b952eeae38b1aca1b3bcf08a2ab37e42be8fbf8ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF1 5668 bytes
font_01_sfnt_off0000e26c.bin
4d480ec050a938cb7416441090791be8f7a4a21bb39d0e41ce309a3d74f6cc5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE26C 10724 bytes

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