Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2f9ef9e68541cfb…

MALICIOUS

PDF

80.2 KB Created: 2021-03-18 08:15:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2bae9de06421be4be3b6431fb0b0c6e6 SHA-1: 70a93f71412575bf2ad370c3f46e23e2dee17017 SHA-256: a2f9ef9e68541cfbb66714060bf4e514951c52711f9bd605f0d79fb93e3b66bf
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 0.9995

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://zajinet.ru/wix?keyword=massachusetts+agi+worksheet+on+form+1+2019 PDF link annotation
    • https://cdn.sqhk.co/dodipenameki/Uibihjf/97278444176.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408598/normal_604f4124ec874.pdfIn PDF document text
    • https://cdn.sqhk.co/xokebuzizo/6ijq0ih/dragon_kingdom_2_release_date.pdfIn PDF document text
    • https://kefexogutifega.weebly.com/uploads/1/3/5/3/135309882/31add013990ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367305/normal_6039faf69442e.pdfIn PDF document text
    • http://vunirokagora.22web.org/dosorinifozolebunetiril.pdfIn PDF document text
    • https://fanejutasoja.weebly.com/uploads/1/3/5/3/135399707/907124.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/Dvidgjl/android_nougat_32_bit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452398/normal_5fda732dde7b5.pdfIn PDF document text
    • https://cdn.sqhk.co/zujumatatub/ajcMCrM/free_1010_block_puzzle.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pafaxifusawa.rf.gd/kazagefuwotuwigonogir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/308a75e3-95f4-4833-ba46-e500a56749b1/6210384417.pdfIn PDF document text
    • http://muvegeposobaxog.rf.gd/33866087544.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/vocabulary_for_ielts_speaking.pdfIn PDF document text
    • http://pasukebufi.rf.gd/butternut_hf6v_antenna_verticale_hf.pdfIn PDF document text
    • https://s3.amazonaws.com/dabatisew/64886667971.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/html_code_for_registration_form_w3schools.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/852ed1a1-f2fc-4bd5-821f-d0f2cc44f3cb/20696484876.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/ammoniac_formule_semi_dveloppe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad10783b-5d83-4b91-bc19-2d10ce2b3a1d/what_is_the_best_meal_replacement_diet_for_weight_loss.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/81695449205.pdfIn PDF document text
    • http://fawivemepogu.epizy.com/46488681931.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA7 5788 bytes
SHA-256: 35ed26172c545f4a1c3d0875b4ab00be8dc4f05204d6874e6c20e6ed8f3a1931
font_01_sfnt_off0001004c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004C 10868 bytes
SHA-256: b529c3d154f3a9c9f34d55875ea7a833a137adcec912d7fa4cf82f6b0c5258fd
font_02_sfnt_off0001254c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254C 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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