Malicious PDF — malware analysis report

Static analysis result for SHA-256 49ebfe4bc12b1e81…

MALICIOUS

PDF

76.8 KB Created: 2021-04-03 16:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: bd66093b9116f3634817b86d1de45f13 SHA-1: e05538aae215759f69f64e6e557ff2f6e9175aa3 SHA-256: 49ebfe4bc12b1e8170bd7e166fbfaf4d6406e3636a9594c9f4515dae8a3e8b46
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, suggesting a phishing or malware distribution attempt. The presence of 'wkhtmltopdf' in the metadata and the ML classifier's high confidence further support a malicious classification. No scripts were extracted, but the overall structure and URL distribution indicate a phishing or malware delivery vector.

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://nipisod.ru/wix?keyword=omegle+free+omegle+chat+apk+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490132/normal_6012a8a828b03.pdfIn PDF document text
    • http://retamos.mygamesonline.org/39347448610.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374359/normal_6015868b27ea9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402953/normal_6026c0f888d32.pdfIn PDF document text
    • http://vsedlyatebya.xyz/nujufizudasuvevasazopmn2zi.pdfIn PDF document text
    • http://xifadezuzurap.medianewsonline.com/fusionner_plusieurs_en_ligne.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387815/normal_5fd8a12cea8b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486200/normal_6012e1f69269e.pdfIn PDF document text
    • http://shtampshop.ru/focusrite_scarlett_2i2_price_in_nepalokqxh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417306/normal_602f798af3e9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384832/normal_5fea0c3578057.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426263/normal_6018430a1e917.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474456/normal_603eb55b68e1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458389/normal_6040e12183ef8.pdfIn PDF document text
    • http://fakexexu.sportsontheweb.net/xugosureburageges.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425772/normal_601f931326750.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nujilexulajuwup.atwebpages.com/nail_art_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4280e87-3bbd-4955-9f09-3853532ba17d/jimegowi.pdfIn PDF document text
    • http://setovoj.onlinewebshop.net/simple_present_exercises_perfect_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/220111ac-b82b-46bd-b91f-e821bdbb9aa1/old_school_house_music_2000_tracklist.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_off0000ebc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC8 5576 bytes
SHA-256: 90f56950fc6ffcc5c7eaf9e176c92e3ff73e83382ef0bf1f63e8af1407afc2f6
font_01_sfnt_off0000feb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB0 11608 bytes
SHA-256: 0a98671819bcee7540039ac0f35ab7fcced7c14ca70cc78683ab5a3e7c571450

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