Malicious PDF — malware analysis report

Static analysis result for SHA-256 390c0a0715cff631…

MALICIOUS

PDF

87.4 KB Created: 2021-04-04 16:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1d1ea389fa18cbc8725817ac12a559a8 SHA-1: de9ef4976cc5567239f4b0ab11fa2ecb3d79be40 SHA-256: 390c0a0715cff631b32a3296de2c523a9088cf6bb58719515cddf87e77969553
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to a suspicious domain, which is likely used to host a phishing page or deliver a second-stage payload. The document body, though heavily obfuscated, appears to reference 'Ironman chattanooga race report 2019', suggesting a lure to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/123?utm_term=ironman+chattanooga+race+report+2019 PDF link annotation
    • https://cdn.sqhk.co/xoradofexul/jSuhaFw/.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/zo1iige/miwamido.pdfIn PDF document text
    • https://cdn.sqhk.co/dugelabomaw/cifaih5/time_management_encyclopedia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489835/normal_602ee6640c8eb.pdfIn PDF document text
    • https://cdn.sqhk.co/gizukakom/vsPJJgh/57941848781.pdfIn PDF document text
    • https://cdn.sqhk.co/suzeboxiwo/jKhhLgj/37918768239.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380084/normal_601ef39959bc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379030/normal_60270a4e7e868.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420237/normal_5fdca43245c55.pdfIn PDF document text
    • https://cdn.sqhk.co/zuzipogowita/T95nPhc/21381425975.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_d9fa34e44fe549a18855beba6b3759c1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/67787b77-34ff-4edf-baae-c7a4c79d5eb4/whats_the_meaning_of_the_word_potato.pdfIn PDF document text
    • https://3f46bf15-0a8c-4e80-b3e5-a2e3bf90e008.filesusr.com/ugd/8e6e76_26280ac090fe48f4b477927269be4cad.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5329f5a-e18e-46cb-8a5c-f78ecc4825ef/saluxuvofolapejuluzamesi.pdfIn PDF document text
    • https://cb71deac-5427-4a11-aec2-6feec017c243.filesusr.com/ugd/4cd983_539fc159cb6f42b4a56879ea12b5b26c.pdf?index=trueIn PDF document text
    • https://cb38ef3f-1f2c-4622-8962-dca261660167.filesusr.com/ugd/3ae201_aa94bbdb3c954e358dca111200e8a607.pdf?index=trueIn PDF document text
    • https://aece7fbc-7072-4055-9cfa-29e0da41b620.filesusr.com/ugd/e878fd_542261e9e4fd4fd9b936dd68fb03ffdb.pdf?index=trueIn PDF document text
    • https://3d9856c9-ddaf-40ef-ab37-14107f3d3ee7.filesusr.com/ugd/938106_1aa319c0e77c40c3ab0d9660f9b72d22.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_off000114a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A6 5556 bytes
SHA-256: 8516d0f1f0b5954237e74ec05af3ca7dee04d1cc36ac57d3901658809bbeefa2
font_01_sfnt_off00012765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12765 12004 bytes
SHA-256: 1e6cb442b0d472abefd949df3a12e2f40e6da55254de6064c08b42e98092dd84

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