Malicious PDF — malware analysis report

Static analysis result for SHA-256 e13f0a2971c86c55…

MALICIOUS

PDF

74.1 KB Created: 2021-04-04 22:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: b2eff450188f7711e91cee2e0fa848d3 SHA-1: 563293e9e1a1441ca785136735b965a4973c5ee7 SHA-256: e13f0a2971c86c5530b93cbcbe80ffd916da860b98355dd02e5b557d2c6d8bc6
96 Risk Score

Malware Insights

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

The PDF document contains a heuristic firing for a 'PDF_SEO_LINK_FARM', indicating it's designed to host numerous external links. One such link, 'https://seumenha.ru/award?keyword=blue+is+the+warmest+color+book+pdf+free', is embedded within the document's content, suggesting a phishing or SEO manipulation tactic. The ML classifier also flagged the PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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=blue+is+the+warmest+color+book+pdf+free PDF link annotation
    • http://front-glass.website/jurassicraft_wiki_fossild6o4d.pdfIn PDF document text
    • http://wadixokup.22web.org/from_third_world_to_first_quotes.pdfIn PDF document text
    • http://resimpub.com/67110662527s55hj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/15788080069.pdfIn PDF document text
    • https://f6ce3cfb-f922-470c-9e0e-eaf724001b0e.filesusr.com/ugd/defcb2_a1d9e90d882546418cf18b23e504ca52.pdf?index=trueIn PDF document text
    • https://7a9095e9-4ba3-4ff7-9406-a75d0382ce8a.filesusr.com/ugd/db93e9_6b0aa60c0b3d4180acbcfa3a0d665a74.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/158cac98-712b-4377-b0dc-af827a95b9b7/gakelajegojogajev.pdfIn PDF document text
    • http://zovagupegi.rf.gd/31773422308.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/posaxijifovatibofobudok.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/materi_akuntansi_biaya_lengkap.pdfIn PDF document text
    • http://mutodavop.rf.gd/kefir.pdfIn PDF document text
    • http://dobowoni.rf.gd/ankylos_implant_system.pdfIn PDF document text
    • https://2cc3dcad-61c1-4442-8662-ca5be7cd8672.filesusr.com/ugd/71b93f_5ea67174ce804250abd567a1eb80777a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/41c6ce2f-78dd-4f2d-9c79-f99cd39c95c0/forex_trading_strategies_reddit.pdfIn PDF document text
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_c9cf388c89b6453d9d183fee4bc577fc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aa0f2e1-feb3-49f8-81e7-61c63d7e9462/mink_eyelash_extension_classes_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/counter_strike_1._6_warzone_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/forrest_gump_feather_theme_piano_sheet.pdfIn PDF document text
    • http://kazupisejurig.rf.gd/godepixe.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/55282814322.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/10th_cbse_board_exam_2019_date_sheet.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_off0000e177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE177 5740 bytes
SHA-256: dd8ebea1a3abbd7b5e6a25735fa057584312dcd3ba5c440683c831d48e8df458
font_01_sfnt_off0000f4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E7 10660 bytes
SHA-256: ca514e4216b9d202d39042aef7635787817d031313ededeedfb2ac6f88c966fd

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