Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa664f67e70f073…

MALICIOUS

PDF

91.3 KB Created: 2021-03-20 17:25:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d80b7bb58354c4bbf5cb56d283e16d55 SHA-1: 9cc818086319e51d5b9a765faa1dc49bc1f4a95c SHA-256: 5aa664f67e70f073e11fe19c760c94f621fe1f23295a352ca0b765de2fe3d821
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to 'career journal guidelines', suggesting a phishing or social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=career+journal+guidelines In PDF document text
    • https://cdn-cms.f-static.net/uploads/4496815/normal_60402c82d909f.pdfIn PDF document text
    • http://gojevomarokabe.getenjoyment.net/79624868662.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450351/normal_604efc9a83e48.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445890/normal_5ff56053a0142.pdfIn PDF document text
    • http://dexaputanit.mygamesonline.org/83721883019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487622/normal_5fe03bb527993.pdfIn PDF document text
    • http://pusewuvi.medianewsonline.com/arms_reach_co_sleeper_mini_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaa49e6a-251c-437e-99de-5a533ca72af6/how_to_print_2_sided_brother_printer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64c9054b-c98f-4d40-98c5-b0ace164640a/32626178597.pdfIn PDF document text
    • http://pexirud.onlinewebshop.net/fadutitusamenuzisotevi.pdfIn PDF document text
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_14149e554d3149db88059a84e174907c.pdf?index=trueIn PDF document text
    • http://vanobibufasapes.rf.gd/52345753091.pdfIn PDF document text
    • http://koriwironawuva.myartsonline.com/xobudiwazi.pdfIn PDF document text
    • https://8e6fe9cb-6e01-49b8-a8bf-add1d7538daa.filesusr.com/ugd/4e948c_03576c850c924f40847093db6571855d.pdf?index=trueIn PDF document text
    • http://mubaviz.epizy.com/juterozolexisexex.pdfIn PDF document text
    • https://467375c7-a7a6-4806-a9b7-892c2a528f89.filesusr.com/ugd/911174_a9331535c2024d8bbebf305aee8c7b30.pdf?index=trueIn PDF document text
    • http://kiduvunizujenav.rf.gd/adding_fractions_with_like_denominators_worksheets_word_problems.pdfIn PDF document text
    • http://goromanoza.rf.gd/aruba_clearpass_mib.pdfIn PDF document text
    • http://nogibusap.epizy.com/agent_carter_movie_in_tamil_dubbed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92f13ab9-e7b7-45ec-aea6-ade55fc1bd6a/pugeratoli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea3689d5-0f7a-495e-80b8-cb1c0bb8fce8/36026184347.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9d5b2f0-7ed2-48a1-8f81-fa8e3927b7e9/vajanezofibelipowebudige.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://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_off000112e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E2 4976 bytes
SHA-256: a63a80275ea66b87d5460811b02d4f2f4b6ad005e0e5ac1345d2781c11292e52
font_01_sfnt_off000123d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D8 10804 bytes
SHA-256: 28410deafe3c787cf7d0ccbb063e01c4e0a242c3d8eb6232db49d10d703abe6d
font_02_sfnt_off000148bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148BF 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449