Malicious PDF — malware analysis report

Static analysis result for SHA-256 827998baf1fbb267…

MALICIOUS

PDF

90.1 KB Created: 2021-02-24 23:41:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 54195c03834b0fd22c2fbeb410470677 SHA-1: b2df16aeeaa563253c6b0923a3e8e4d3525f0fe9 SHA-256: 827998baf1fbb267cef4b7ee894ce6aca096a7ce7b4c688f2d4fed8c7c941fc9
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it is a phishing attempt. The document body, though heavily obfuscated, appears to be a lure related to a technical query, directing the user to an external URL. The presence of the 'SE_CLICKFIX' heuristic suggests the document is designed to trick users into executing commands, likely to download and execute a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://jottigo.ru/123?utm_term=what+does+orange+battery+light+on+acer+laptop+mean PDF link annotation
    • https://cdn.sqhk.co/temirikuji/Kguitjg/rokewibinumibetaraniv.pdfIn PDF document text
    • http://fullhp.info/diluxamcopvv.pdfIn PDF document text
    • http://trenolgia.buzz/940563594660go5n.pdfIn PDF document text
    • http://instasale.company/7528747111mizec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471959/normal_5feb4431c2643.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408864/normal_5fd153bd4007b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383806/normal_600ede720a74e.pdfIn PDF document text
    • http://pixunune.sportsontheweb.net/what_is_big_data_and_analytics.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/gislibi/don_saladino_supplements.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426557/normal_602ffb4246dff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jizubisetebof/reduretojajexebelu.pdfIn PDF document text
    • http://gipebevu.atwebpages.com/how_do_you_critically_analyse_a_journal_article.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/easy_way_to_determine_bond_order_from_mo_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/74869762764.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/best_android_ebook_reader_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/ejercicios_de_enlaces_quimicos_resueltos.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BA 5532 bytes
SHA-256: fa2aa31e85c18ed5840248ca331eb2becba0ee27aafe989e663bd5e5c9988e43
font_01_sfnt_off0001085c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085C 1804 bytes
SHA-256: b15ac712fbd0d75030ff5f58b86ec035356fd6a1c3b3338d36fb3215315cb5bb
font_02_sfnt_off00011139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11139 10588 bytes
SHA-256: b31b9e03a91d73dbab2056e55e67b60a2a4f915341dc1c68c084dc6c11ab79d1
font_03_sfnt_off0001355a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1355A 16852 bytes
SHA-256: a5542c9f51f4b9357e9f0b95b7f93257cdf1bfbc09a7c0b94cd0906ac889f8ef
font_04_sfnt_off00014bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BDE 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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