Malicious PDF — malware analysis report

Static analysis result for SHA-256 086e51edccc48c72…

MALICIOUS

PDF

77.4 KB Created: 2021-04-01 08:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 84ccd683d467f27b482d8d4aa7cdd937 SHA-1: 58df60c7c1c02f1f9c9f0d2586ad15f339152328 SHA-256: 086e51edccc48c720c32569d2663c84a3e5d2576f0115de3d2e9ccfc1d90c56e
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one specifically pointing to a resource titled 'Oxford student dictionary pdf free download'. This, combined with the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic, suggests a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

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://jacksth.ru/award?keyword=oxford+student+dictionary+pdf+free+download PDF link annotation
    • http://ruzazeruduzelu.22web.org/tetodowigupuk.pdfIn PDF document text
    • https://wopuvonu.weebly.com/uploads/1/3/1/3/131384791/subobidixomos_xojazirumufidix_wetise_nasoja.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377933/normal_5ff68167cdbd9.pdfIn PDF document text
    • http://sexugaweguko.iblogger.org/semalulawatin.pdfIn PDF document text
    • http://milesnires.xyz/english_conversation_practice_sheetsnceu8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419628/normal_5fd160998ce04.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387581/normal_6006ae9e6cf4f.pdfIn PDF document text
    • http://lnstagram-verificationbadgeform.com/vodopufifogukuluzomotasuvsgb7.pdfIn PDF document text
    • http://therarbooks.com/pin_diode_based_fire_sensor_downloadz5zta.pdfIn PDF document text
    • http://1xbets-regs.site/62397242696hrzjq.pdfIn PDF document text
    • https://menanolunum.weebly.com/uploads/1/3/4/7/134754058/foxoworadenera.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tevigotu/how_many_hours_can_directv_genie_record.pdfIn PDF document text
    • https://7a1f2a0d-094a-4466-88af-72a4af93b9fa.filesusr.com/ugd/22739b_4e84fa9a66c2417fa01662c1d2413f6a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/misudunepezelutuzu.pdfIn PDF document text
    • https://s3.amazonaws.com/woxorojero/83131364632.pdfIn PDF document text
    • http://rejinivak.rf.gd/42030068994.pdfIn PDF document text
    • https://5e446c31-fcb6-4427-a178-91ee45bbff8b.filesusr.com/ugd/4e76b8_7a188f264c56498cb365e03049a01cfa.pdf?index=trueIn PDF document text
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_a00f14d89acd4c818dab50fa66634e28.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_off0000eecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECD 5436 bytes
SHA-256: 2124a634b670c7f9b8ebd694d7d29122fc7a325b3b09573944052be91bef6cea
font_01_sfnt_off0001017c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017C 11388 bytes
SHA-256: 9089877cee332483756179430f87cebbc60281ce2f6bbbc4580ba886ab20296c

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