Malicious PDF — malware analysis report

Static analysis result for SHA-256 0906f59df6858902…

MALICIOUS

PDF

77.3 KB Created: 2021-04-06 15:41:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7c8d1bae2377f632e752e193983714b SHA-1: 7ae5791a9d27d258058f213ef728a568b1096ee8 SHA-256: 0906f59df6858902c389fdeff3146a648410ebd3b1da2572e2715cc47dfda2ac
96 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. The embedded URL points to a domain associated with phishing, and the document body, though heavily obfuscated, contains text related to a water heater manual, suggesting a lure. No scripts were extracted, but the PDF structure itself facilitated the malicious URL redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/strik?utm_term=atwood+rv+water+heater+gc6aa-10e+manual
    • https://cdn-cms.f-static.net/uploads/4406793/normal_60490f15dc5f9.pdf
    • http://lubenoredeji.mypressonline.com/1021667104.pdf
    • http://xexapitanegis.getenjoyment.net/blank_comic_book_template.pdf
    • https://cdn-cms.f-static.net/uploads/4481064/normal_6048e99c03149.pdf
    • http://konalofasu.mywebcommunity.org/23061672488.pdf
    • http://sosutisokalelul.iblogger.org/78507247807.pdf
    • http://zugugalepew.mypressonline.com/wilusumimujipenub.pdf
    • http://kafidovomiguvo.mywebcommunity.org/what_is_the_world_political_map.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/posaxugidut/how_to_start_electronics_business_in_pakistan.pdf
    • https://9f503c4c-bf14-4dcb-9a7a-68e0e5bb3568.filesusr.com/ugd/8ac1ab_7896ddceb4c34914ab19e617157ae6d4.pdf?index=true
    • https://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_498096912fce473faad1975d87a974eb.pdf?index=true
    • https://s3.amazonaws.com/welanisowari/bartley_ridge_floor_plan.pdf
    • https://30372bae-fb3d-4285-bee0-d91e70c22047.filesusr.com/ugd/835091_ca79100850b1479c8a8c807a1cd3b69b.pdf?index=true
    • http://noxukimu.myartsonline.com/rafazofurolof.pdf
    • http://tisavan.onlinewebshop.net/21074487050.pdf
    • http://fijopuk.rf.gd/how_do_i_reset_my_dodge_uconnect.pdf
    • http://pevivudawof.epizy.com/gcf_worksheet_for_grade_5.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_off0000efbe.bin
fc020ba4fa3db1362b35dd5cd0ccadd96a9cb0aef15b6ab7abe109956201155a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBE 5696 bytes
font_01_sfnt_off00010325.bin
0d4c105a2f7af7ab880f1c07c930e4bf2ad857124cc8109b2c7aa09f16acbfa8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10325 10812 bytes

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