Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5252d5ef8d9b6b9…

MALICIOUS

PDF

82.3 KB Created: 2021-04-07 09:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b3a697e2c9c4607dd82683eac3c9ff8b SHA-1: 94e248fd306f1f33ed2e92b8140ebb5d8951a90a SHA-256: b5252d5ef8d9b6b99230275ab1af3f8d97afac549eb5ad182f5f99cc4ddf3a90
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 0.9991

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://soxebez.ru/strik?utm_term=one+thousand+and+one+nights+synopsis PDF link annotation
    • http://theplafond.xyz/ultima_5_tens_unit_user_manual1lr5e.pdfIn PDF document text
    • http://bio-ita.fun/difivisofepisazctq7i.pdfIn PDF document text
    • http://tuimag.ru/46541153173jpkrp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465691/normal_6029515b718d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470689/normal_604f5596d8531.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389570/normal_5ff8fdaf6718f.pdfIn PDF document text
    • http://chambrehq.xyz/29667734285vyeai.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501975/normal_6052a91e06f59.pdfIn PDF document text
    • http://digtalcaliper09.xyz/vikatejaws1ai.pdfIn PDF document text
    • http://abwaab.su/the_last_rung_on_the_ladderfbyj6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497344/normal_5fdb758b2c186.pdfIn PDF document text
    • http://6gusevshop.website/tudunubumotifagugin101xe.pdfIn PDF document text
    • http://microdigitalmeter.xyz/complex_fractions_worksheet_hardnymhx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_ee8ef9f0636243b788a05423e3b577da.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/45790285706.pdfIn PDF document text
    • https://1580f21e-fc75-4350-9669-3be8b7525729.filesusr.com/ugd/eff6cf_fcdc14c32f5343f5954c89c9b06cbcf8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/tezipupepukuguvumolo.pdfIn PDF document text
    • https://cb47f074-0476-4434-b381-5672a365cab8.filesusr.com/ugd/c46c8a_f4f3fafad75c447797488d5523dd3ffd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/booth_multiplier_algorithm.pdfIn PDF document text
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_7f9b3f0e07e94201ad09d57af4b2a4a0.pdf?index=trueIn PDF document text
    • https://da4cb982-96ac-4827-b01c-1601b1c9977c.filesusr.com/ugd/b05c40_1693b69310a34760ba0bf01a980a6cec.pdf?index=trueIn PDF document text
    • https://aed022ca-8a9d-452d-9022-56a74a585a14.filesusr.com/ugd/4d548e_9b92ab334243493f8b915a98b4664702.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jeponowon/bms_degree_full_form_in_medical.pdfIn PDF document text
    • https://68e1e3d4-268d-49bc-a8aa-b119cb10fea7.filesusr.com/ugd/3ceeb9_53245d4fb98c4811bfc429b6d4358937.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_off00010472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10472 5220 bytes
SHA-256: 9c9ae6279ec707b47eb9ab2dd9bde43ade26dde76b56c62b0ef1262b2631675c
font_01_sfnt_off0001163a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163A 10844 bytes
SHA-256: a5be71f3c6935261883b24cb241f5e0fa98541e83b63767430e830b6d2af9bdf

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