Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbe727a508e36fd7…

MALICIOUS

PDF

77.8 KB Created: 2021-03-24 11:30:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d36b07dd75e7b4b570e6d26220538c8a SHA-1: f55f202644fe01becf589530b7d86cbb379b1e67 SHA-256: dbe727a508e36fd7853404d5ad9a32fcbd0d534ffba69855b2b820c6b6162fd1
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

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://vilenefex.ru/123?utm_term=protect+balloon+game+apk PDF link annotation
    • https://dekukosozo.weebly.com/uploads/1/3/1/0/131070054/nufuxosopefazupatug.pdfIn PDF document text
    • https://waguxezemi.weebly.com/uploads/1/3/4/7/134703223/vimisumemefizez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390385/normal_5fcbbcf293428.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470836/normal_602ff0ba9a042.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454436/normal_60446bd72b486.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455639/normal_60376bd22d0cd.pdfIn PDF document text
    • https://vibikawezawu.weebly.com/uploads/1/3/4/7/134734059/nodetix.pdfIn PDF document text
    • https://jawuvufos.weebly.com/uploads/1/3/4/8/134856807/6378f3f63cc6a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426813/normal_600581d6451a7.pdfIn PDF document text
    • https://vakogiguwowokel.weebly.com/uploads/1/3/0/7/130775334/rakuraradesonal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457011/normal_5fe748b14a024.pdfIn PDF document text
    • https://firizuvamo.weebly.com/uploads/1/3/4/6/134618899/9f22a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382423/normal_5fde793e9565a.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
    • https://s3.amazonaws.com/nutanigonu/jedusi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a8b3574-3d63-4987-b852-462425877b40/black_and_decker_mouse_sander_parts_bdems600.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/aplikasi_bri_mobile_apkpure.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/how_do_you_pay_for_a_rental_car.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa60910a-2c99-4228-90f5-9e3000d0a954/what_is_chemical_structure_of_acid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1a308d5-6994-4579-80ab-7c2867e4f2bd/are_ilive_wireless_earbuds_good.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_off0000e455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE455 5020 bytes
SHA-256: ecf49ce3120de37853250d3fadd5a0076808e94843678bfae8daa5946deb19d6
font_01_sfnt_off0000f549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF549 11392 bytes
SHA-256: f2fbaa36d4f7e7bcc0854dc38e504155b4e8d4ad059871f5126a9f9816654529
font_02_sfnt_off00011c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C15 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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