Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d8f3ec72932ea6…

MALICIOUS

PDF

83.4 KB Created: 2021-03-08 23:33:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f43ff9faa369d2f21cdfc1afcacabb7a SHA-1: 5ca7c7a48ea2073664ad35648f84d606b60d1ec8 SHA-256: b1d8f3ec72932ea64fb64ef90fd97c63cf767bae63e315a24db2b9a347f75b1e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm its malicious nature. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/strik?utm_term=diversity+training+discussion+questions PDF link annotation
    • http://6gusevshop.space/greater_than_less_than_printable_worksheets_first_gradecc69n.pdfIn PDF document text
    • http://d-youtube.com/zamegoxekiroxafurn48yd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366377/normal_6014716cec1d9.pdfIn PDF document text
    • http://hookup158.fun/buckingham_palace_floor_plan5xf6s.pdfIn PDF document text
    • http://naturagrush.space/70639731040v2odj.pdfIn PDF document text
    • http://vostokzapad.su/21166489128ifz4a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424997/normal_5fec31b8c2aec.pdfIn PDF document text
    • http://apsdd54gfv.xyz/quickstudy_laminated_study_guidesxzgs9.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.site/45502494194jlwj5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427076/normal_603a5835a55f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448540/normal_6042034b5ee88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409998/normal_5fd120d245f89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500667/normal_6006ff4535d42.pdfIn PDF document text
    • http://helplnstagramcontact6088757.com/mifi_6620l_antenna_adapter5482b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf09704d-ee35-44d6-a983-fa5ef40565ea/gesimoso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cf758d2-9baa-4836-bbec-9620fd21217a/kavagam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1c32556-523e-49e5-b6d8-cdc643ba9dd9/28032653153.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa76fe78-2e76-40a7-b172-bfb35b851fe4/65294786134.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c78be5d0-1d4e-43e4-8b1b-d32ec6805afa/how_to_build_a_hybrid_mobile_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1655015-6e77-4132-af4c-c251ff80b1f9/chick_fil_a_first_100_rules.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1814b88f-3b19-4ecb-9d62-409ebf10b520/delonghi_portable_air_con_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff61b6cc-3f27-48b8-a826-97d8dfedd311/88151796579.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_off000108e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E1 5360 bytes
SHA-256: c5e3bf4e369afb4fd728d01ea4b4b2d97271fa2f4aca33ee6e9d0f8f7c16b579
font_01_sfnt_off00011b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3A 10884 bytes
SHA-256: 2d3c1938bd702ca59795148eec0e49d9a4d7d3f265c47a19a428d841bc6d4291

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