Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c0e6338cf3f58d2…

MALICIOUS

PDF

78.0 KB Created: 2021-03-29 02:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 28d62a4e6b510d0da61c809ae8107d7b SHA-1: 924b98e14151bf75d6039dbfa047087c2ef49195 SHA-256: 7c0e6338cf3f58d2113f790873024e8fa434bb68cb4876c3e2e9e32b594f8a64
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to 'happy faces to color', which is a common tactic to entice users to click on malicious links.

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://resalured.ru/strik?utm_term=dibujo+de+caritas+felices+para+colorear PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4385417/normal_5ff3b667d3b56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503390/normal_600c58e6ccf28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391314/normal_605eeaf2ae61c.pdfIn PDF document text
    • https://cdn.sqhk.co/dedesonor/icdwjgx/lukoroxovav.pdfIn PDF document text
    • https://cdn.sqhk.co/lusajiki/gii8jg8/religion_in_china_statistics.pdfIn PDF document text
    • https://cdn.sqhk.co/nojedevatas/gheRDLW/grand_theft_auto_online_download_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/zorezikuluz/hgfLdlq/bapaxejixavaramemexuzit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483354/normal_60316edb8045a.pdfIn PDF document text
    • https://cdn.sqhk.co/tibapopedeka/ggFtwHC/bowl_meaning_in_english.pdfIn PDF document text
    • https://cdn.sqhk.co/wewutivuv/ejhiidy/bsde_annual_report_2016.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/PibLjcP/clothes_worksheets_clipart.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c2267750-1f6d-4c2f-944a-eb302c7f07d7.filesusr.com/ugd/93971e_d9ab3f3070f24532b8c86eafb430ef9f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/62260423792.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/basic_maths_formulas.pdfIn PDF document text
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_b9cb4beb0b6646bfb26f75834e7811f9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/90769fc5-5e80-4429-bc13-8022d0307f96/talukoko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d11137a-3483-4678-a73b-42bbcfa0db9f/how_to_fix_cracked_picture_frame.pdfIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_6b7b6900551848a6a5bac7a194648b23.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/nofedatujojapiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d3bcbf7-8bc4-4352-a7ba-46df033e2b99/gevagukut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/540aeeca-fa4b-4b98-8038-a963a8047520/tepogapudenimi.pdfIn PDF document text
    • https://4cd5a77a-be8d-44ba-8952-4177873115c4.filesusr.com/ugd/930050_2a51b06ca06a4ac89a5eee2e2b9fc071.pdf?index=trueIn 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_off0000f53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53A 5364 bytes
SHA-256: c55f76ff529396d40827a8719b3be80f58974be94fcab592e47f6fcb00471200
font_01_sfnt_off00010787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10787 10832 bytes
SHA-256: dd905f30b18711fcabc28852347464e7e9e172887d6636b2d51f37be33754d5d

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