Malicious PDF — malware analysis report

Static analysis result for SHA-256 7089bbdb2f3c8843…

MALICIOUS

PDF

74.6 KB Created: 2021-04-01 04:41:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f3105dba67b1731c3d97f7e9e844343f SHA-1: b0f29de84d5e52c3ea285a964e6fe02fd8688ee9 SHA-256: 7089bbdb2f3c8843f50ccde96cf3d8d53a2b7bbfc8e40d3fa42d2c1dd1b098c9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to obfuscate malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and the link farm heuristic suggest the primary goal is to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/123?utm_term=comparing+and+contrasting+worksheets+grade+2 PDF link annotation
    • http://wobepatonogez.iblogger.org/louisiana_purchase_1803_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/vopiruwikil/ZHsLljb/vukurevukik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452851/normal_603c0b91598ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374847/normal_60053f54c0a75.pdfIn PDF document text
    • https://cdn.sqhk.co/vikojovowoso/gj9V4if/lilim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407301/normal_604913d175386.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386842/normal_601ef479c810e.pdfIn PDF document text
    • https://cdn.sqhk.co/xugiwatokax/1euMihm/clarisonic_smart_profile_uplift_user_guide.pdfIn PDF document text
    • http://dogosufomume.iblogger.org/laxujebexoxopurajumifivek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475741/normal_60272ed33973c.pdfIn PDF document text
    • http://bebetadiruj.mywebcommunity.org/statistical_foundations_of_data_science.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://teropisarazo.myartsonline.com/dewalt_compressor_d55146_review.pdfIn PDF document text
    • http://denijutogowe.rf.gd/ordinal_numbers_exercises_with_answers.pdfIn PDF document text
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_8eda2f990f8143169ccdc2765cf144a9.pdf?index=trueIn PDF document text
    • http://porojerosisogu.rf.gd/geometry_dash_chrome_web_store.pdfIn PDF document text
    • http://xekabotiwuker.atwebpages.com/wenepedoj.pdfIn PDF document text
    • https://87b84290-c0b3-4c73-97a1-3d59c64c3f69.filesusr.com/ugd/c638b7_977b4745de7641df98e5560b82f8833c.pdf?index=trueIn PDF document text
    • http://gupatevefojip.myartsonline.com/23381361439.pdfIn PDF document text
    • http://robebiwasufilu.epizy.com/healthy_low_carb_vegan_dinner_recipes.pdfIn PDF document text
    • https://3f740848-0e57-4b51-8596-564812021bec.filesusr.com/ugd/cbe17c_047f0129f6784c999eac3e9eca70c5ac.pdf?index=trueIn PDF document text
    • https://9f9bd9fa-00fe-4673-b34e-9a629881f524.filesusr.com/ugd/09273f_3d43880117d143539fab400bdf2aeec6.pdf?index=trueIn PDF document text
    • http://mozaninukokefef.onlinewebshop.net/1_to_10000_numbers_in_words_in_tamil.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_off0000e471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE471 5648 bytes
SHA-256: 317a465463165a025277f30b1c4ddc2b80ed37af5b1692521627b0affd4dfb28
font_01_sfnt_off0000f787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF787 10912 bytes
SHA-256: 2ad776de0dc5cea6e835e272173a64c20ad69492c06234021bafae61dced1715

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