Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6138f5465494cc0…

MALICIOUS

PDF

85.6 KB Created: 2021-02-28 22:02:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 0724dbf25dd629855b257c3e91c091b8 SHA-1: 1ed378e7096aaf085d75844841721117409511f6 SHA-256: e6138f5465494cc06a7048b2ee8389f09f9ad540c574efb1c26209a883776aa6
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm or SEO spam operation. The ML classifier and ClamAV both strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The embedded URLs suggest an attempt to redirect users to potentially malicious or ad-filled websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://botokaw.ru/strik?utm_term=philips+norelco+series+7000+beard+trimmer+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393034/normal_6031fb4020dc2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486036/normal_5fe3c34d1a646.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444638/normal_60171a40d531d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422638/normal_5ff0abb7a7b0a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445881/normal_5fc86fd7d3051.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480749/normal_6010d959b5b48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409813/normal_602e9ed36425d.pdfIn PDF document text
    • https://cdn.sqhk.co/lezubenewago/ihgdggK/professional_photographer_near_me_for_baby.pdfIn PDF document text
    • https://nogenovone.weebly.com/uploads/1/3/4/7/134745979/sebat.pdfIn PDF document text
    • https://cdn.sqhk.co/bowazeduz/jaifjgi/mikecrack_roblox_tobogan_gigante.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420245/normal_601ca1ddc3ab1.pdfIn PDF document text
    • http://golomashvanna.xyz/tenu_ishq_mera_le_duba_song_downloadrpl8j.pdfIn PDF document text
    • http://idealicaitaly-ufficiale.site/dispatcher._invoke_c_windows_formse84o0.pdfIn PDF document text
    • https://wavafawiwex.weebly.com/uploads/1/3/2/8/132815000/musojuzejav_gipurajerekoxa.pdfIn PDF document text
    • https://julalawigito.weebly.com/uploads/1/3/4/8/134869680/8324618.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370778/normal_5fd8d3efaa030.pdfIn PDF document text
    • http://idealslimitalia-official.site/dnd_taldorei_campaign_setting7jo8k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369911/normal_6021ea8caa29e.pdfIn PDF document text
    • https://maparezoja.weebly.com/uploads/1/3/5/3/135321508/zemekinokoz_kanul_mupifibadikoli_dabomuki.pdfIn PDF document text
    • http://domensita.fun/worms_3d_ps2_download1e1xx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456667/normal_602f59b78229e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501214/normal_5fd04a52008ae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00010df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF1 5676 bytes
SHA-256: 53362e664f26193b44ed97690c21576ce49b2d21e5f6ed6878aaba5e606a3461
font_01_sfnt_off0001210e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210E 12368 bytes
SHA-256: ccd940c53a3453baebada847ccdb497856390821f4b134fe72ff74b0a7d33b75