Malicious PDF — malware analysis report

Static analysis result for SHA-256 4447c9a2a3c71449…

MALICIOUS

PDF

74.8 KB Created: 2021-06-04 16:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ee7b5aac0cc968b4fa3ed583165f0e9c SHA-1: e6f58a524280e91b12ad826c55adc59d71b47560 SHA-256: 4447c9a2a3c71449c5a222ba769bdd0189702a3b08ce39b63e185a72c294cbc9
126 Risk Score

Malware Insights

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

The PDF contains an embedded URL that masquerades as a download for 'free fire mod apk unlimited diamonds and coins'. This URL, 'https://crysiq.ru/pbw?utm_term=free+fire+mod+apk+unlimited+diamonds+and+coins+android+1', is flagged as malicious and is likely intended to deliver a second-stage payload or phish for credentials. The ClamAV detection 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0' further confirms the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://crysiq.ru/pbw?utm_term=free+fire+mod+apk+unlimited+diamonds+and+coins+android+1 PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4503987/normal_60b1a75e85053.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415742/normal_6055447020953.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369336/normal_602ce4b39eaa6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493876/normal_5ffade6616264.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/f4c09e1b-c2ff-4d09-af7d-870037f9325b/ritadefixisata.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab38f2f1-4737-489f-bb8b-f7514fe5a4fd/adding_fractions_with_unlike_denominators_and_variables_calculator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e06bf697-5f8c-42d5-8577-e7da6a215de4/77699577074.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2bdbeb4-e7ea-4b61-be52-bd100e8116e2/more_effective_c_vs_effective_modern_c.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a053ad97-6d53-41e2-a26e-5afc3a2164de/how_to_reset_your_voicemail_password.pdfIn PDF document text
    • http://molosafokaji.pbworks.com/w/file/fetch/144546024/wedding_venues_in_las_vegas_nv.pdfIn PDF document text
    • http://lagawiwefe.pbworks.com/f/self_assessment_report_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af78c04e-2de0-4936-aa43-a73abe7b45dc/why_does_gardner_use_zodiac_signs_in_grendel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c9b6adc-96dd-4e10-82c9-bd59dc6cfee9/marie_forleo_make_every_man_want_you_audiobook.pdfIn PDF document text
    • http://togusan.pbworks.com/w/file/fetch/144427182/excerpts_from_the_jungle_by_upton_sinclair_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ef27b82-771e-439d-b125-e7c762a096e3/91889547024.pdfIn PDF document text
    • http://nilanom.pbworks.com/w/file/fetch/144424836/67782422393.pdfIn PDF document text
    • http://taxexuwej.pbworks.com/w/file/fetch/144586617/36612837107.pdfIn PDF document text
    • http://mupalunava.pbworks.com/f/bourbaki_algbre_commutative.pdfIn PDF document text
    • http://fixunomavow.pbworks.com/f/jaya_janaki_nayaka_tamil_dubbed_full_movie_download_jio_rockers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07f239bb-c1b9-4b7f-9bec-f7cdaa3137c1/kuwuxitoselugi.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_off0000e6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D8 5372 bytes
SHA-256: 0352bdd4a45326ccb10256be12f196535e177ff5cedc5624e1f5fdea9c1ac617
font_01_sfnt_off0000f913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF913 10736 bytes
SHA-256: e7ab305ff2ce2881b1d1a9518368fd7e60c640777ddbb0e2d957423ec3c7a5a0