Malicious PDF — malware analysis report

Static analysis result for SHA-256 57476eedf05d5f9c…

MALICIOUS

PDF

76.1 KB Created: 2021-02-15 17:13:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: c0ce126b7110d0c09e4d0b69591b4363 SHA-1: ff900906834db561db9b9cd129c4b5d7e754f6d3 SHA-256: 57476eedf05d5f9c58a7ba6c2e7e255b81a31391749c47a18dd20cabaa05c6a4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing/trojan. It contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://druttle.ru/wb?keyword=the%20unbearable%20lightness%20of%20being%20quotes PDF link annotation
    • http://koreanluxe.com/5147266321784125.pdfIn PDF document text
    • https://cdn.sqhk.co/kesusevuzep/ajj0Son/turbo_drift_3d_car_racing_hack_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490366/normal_6018a2afde9aa.pdfIn PDF document text
    • http://olipaka.xyz/11988121336grr7n.pdfIn PDF document text
    • https://cdn.sqhk.co/nakunadubux/ddhemib/32044894199.pdfIn PDF document text
    • https://cdn.sqhk.co/mojekuvugise/hfLMhix/portal_gun_mod_mcpedl.pdfIn PDF document text
    • https://cdn.sqhk.co/subilikiwi/hfmEMgc/lost_vikings_2_snes_walkthrough.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465003/normal_5fddea0bc267f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365646/normal_5ff1b2ce5548b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390324/normal_5fe1cea656fbe.pdfIn PDF document text
    • https://pixipemojawipe.weebly.com/uploads/1/3/4/4/134459682/pogosape_palori_fenevugokama_wefupadow.pdfIn PDF document text
    • https://kowedeta.weebly.com/uploads/1/3/0/7/130775164/18f9d9a06b.pdfIn PDF document text
    • https://vigijamavo.weebly.com/uploads/1/3/0/9/130968937/2585160.pdfIn PDF document text
    • https://cdn.sqhk.co/jelivapizivo/RXichd5/rgb_color_picker_tool_download.pdfIn PDF document text
    • https://zofigaxukinepir.weebly.com/uploads/1/3/4/2/134235574/4094469.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://gonafumereber.epizy.com/digital_media_agency_website_template.pdfIn PDF document text
    • http://memokikadu.rf.gd/61278147222.pdfIn PDF document text
    • http://tekunobujolid.epizy.com/2093946397.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_off0000e004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE004 5128 bytes
SHA-256: bb513e49e5ce0f3467b452fd4b89d63f8fbc68fd963720a84141551e383463ab
font_01_sfnt_off0000f164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF164 10436 bytes
SHA-256: 4ee040eeaa5a3cfa08131cb202a9f1f4b6b7885011f795948541e795691e74ff
font_02_sfnt_off0001149f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149F 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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