Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad873695162f8f01…

MALICIOUS

PDF

84.5 KB Created: 2021-05-21 13:40:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: cebf24fc393a758b43e7267820970260 SHA-1: 45c4064108d6fcc34eab22b476bbbe6817123434 SHA-256: ad873695162f8f010e4148bf2ac1a06ff368944de8cc340125fc55510fe59e10
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'crophysi.ru'. This URL is presented to the user as a download link for 'geometry dash world mod apk uptodown', indicating a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • 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/strik?utm_term=geometry+dash+world+mod+apk+uptodown In PDF document text
    • https://cdn-cms.f-static.net/uploads/4420431/normal_603a9be16a47a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389616/normal_60286e584abd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368772/normal_5fe940269b16f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486353/normal_602a4e1545ce3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495399/normal_5fefa82533cdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408871/normal_5fd3bbbc3d3c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379844/normal_601af25a52490.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412170/normal_606df9ab644e6.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/kiguteperilodu/dasuwuferujumufezejodofa.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/66673110275.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/vovovufuzojirarumuwovoje.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/jusulifapubogegan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37cfce51-30e5-47a4-beb9-a80f5afc1eee/how_to_test_a_4_wire_oxygen_sensor_with_a_multimeter.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/ambient_weather_ws-_3000-_x5_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/free_text_to_voice_converter_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aafeb61f-38eb-4a4b-b48b-8a5d1c7e4e4b/31997105995.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/what_is_the_order_of_the_hobbit_series.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abc89276-f59a-4906-8535-84fcaef5f888/dlink_dap-1522_firmware_update.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/76244919570.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/filiwi.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/graphical_abstract_guidelines_elsevier.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/26525975021.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/speaker_boost_apkpure.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35E 5320 bytes
SHA-256: 4ea00e490fb724639a75e360192e1ed398b67cdf3d8b2fef0ab812fa1215322e
font_01_sfnt_off0001056b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056B 22044 bytes
SHA-256: 80632e62ef36e2e9ecd2d71ad1f7ef1de09510618d6d3b0bfa82128adeea7798
font_02_sfnt_off000135f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F2 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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