Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e414049447279f…

MALICIOUS

PDF

75.3 KB Created: 2021-05-01 00:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 61085f751789f0033434cef3cfab8d91 SHA-1: 950a4c44840aadf78ea4b511bfa0331400ca8aeb SHA-256: b4e414049447279f7c9126149bb17125bb1f762d5bacbf99b0ff0af5747499d9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://midufefew.ru/strik?utm_term=olympus+om2+manual+mode PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464530/normal_604fa4570ce7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485935/normal_6033fee761222.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451545/normal_604655c72ff2c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490738/normal_5ff13f4548fa8.pdfIn PDF document text
    • http://zahlungsservice-ch.site/gastric_cancer_diagnosis_guidelinesvhmsh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421365/normal_6062fd1d746a0.pdfIn PDF document text
    • http://wabukuxinezu.22web.org/elkonin_boxes_worksheet.pdfIn PDF document text
    • http://hotita.space/luwokarabilagadomeloregmg5y.pdfIn PDF document text
    • http://tesar-krd.ru/platform_meaning_of_marathi_language7ld8a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f3dc8d0a-397f-4303-99a5-a7927e83d850.filesusr.com/ugd/e916cf_a1354aaa99444c879dd0227612f5a361.pdf?index=trueIn PDF document text
    • http://jizokotasaz.rf.gd/kuzewowivetijixoxovev.pdfIn PDF document text
    • http://zatojigetafugud.epizy.com/copaxone_generic_form.pdfIn PDF document text
    • https://d52369c8-37f2-40d9-9d5f-d682b3b4a2e4.filesusr.com/ugd/6d5a7b_f53d4cd0552441d39b3a49a414ed1d9e.pdf?index=trueIn PDF document text
    • https://cc4f1b1a-08c7-467e-bb5a-e3073ad8caf1.filesusr.com/ugd/ffc175_f9427cdef31e49a183e50edb0d0f8912.pdf?index=trueIn PDF document text
    • https://ec8c99fd-5413-4e38-b6a0-2ccbba71fc6f.filesusr.com/ugd/de02f3_f6bbd13eceee4c068b9633275700f6f3.pdf?index=trueIn PDF document text
    • https://e82ff0bd-cb1a-4782-8b92-0a0fb7657660.filesusr.com/ugd/d17951_dda9ea6023fc46b4b911f3eff4169f04.pdf?index=trueIn PDF document text
    • http://malonedutu.epizy.com/useful_chrome_flags_android.pdfIn PDF document text
    • http://zifofupox.rf.gd/surike.pdfIn PDF document text
    • http://jipudovisubu.rf.gd/vumivofifalus.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_off0000e737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE737 5272 bytes
SHA-256: 5906ea9195a25f5e583dd9425416231f95f41b13c9c49f48f820e5d2af2b0845
font_01_sfnt_off0000f916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF916 11152 bytes
SHA-256: 47095e22f7dc234b1d0d2ce893df6a2e2f8d1c7739b02f96003c1f2c162595e6

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