Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1878f444f64d013…

MALICIOUS

PDF

80.6 KB Created: 2021-05-26 19:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0160e3daf92334bb8f8a588d2cfd3af8 SHA-1: 5975af418128a8d6833acb0fcbbe49e5e2814346 SHA-256: d1878f444f64d0132fadb2b3c6e4de924a1542d167470f32384175769a89e726
186 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing operation. The primary URL, https://crophysi.ru/strik?utm_term=gba+roms+pokemon+emerald+kaizo, appears to be a lure for potentially illicit content, further supporting a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://crophysi.ru/strik?utm_term=gba+roms+pokemon+emerald+kaizo
    • https://semitedajun.weebly.com/uploads/1/3/1/6/131636975/xavebefafijana.pdf
    • https://static.s123-cdn-static.com/uploads/4383308/normal_5fe46c8f7f95c.pdf
    • https://tupirusu.weebly.com/uploads/1/3/4/7/134702138/02cd60744004.pdf
    • https://gorijifezavu.weebly.com/uploads/1/3/4/5/134502749/6684643.pdf
    • https://dobumixil.weebly.com/uploads/1/3/0/7/130738680/lipadogixazajifamu.pdf
    • https://cdn-cms.f-static.net/uploads/4448991/normal_604a5811a4687.pdf
    • https://vufagejibuto.weebly.com/uploads/1/3/1/4/131483336/mexidipuw_tajikenovawata_zakim_javojepagax.pdf
    • https://porujigiwafixuf.weebly.com/uploads/1/3/4/3/134373975/57dc3607493c.pdf
    • https://cdn-cms.f-static.net/uploads/4388282/normal_606258c6d037d.pdf
    • https://dekoreriso.weebly.com/uploads/1/3/7/5/137501726/1749547.pdf
    • https://cdn-cms.f-static.net/uploads/4473419/normal_6054235565a39.pdf
    • https://zuxufigosod.weebly.com/uploads/1/3/4/3/134309968/botoxop.pdf
    • https://fawirato.weebly.com/uploads/1/3/5/3/135392883/zisuvot.pdf
    • https://xazefobilizap.weebly.com/uploads/1/3/1/3/131384081/5a9880fc.pdf
    • https://wisokovunali.weebly.com/uploads/1/3/6/0/136051549/joxajasuzam_mikupovikori_xuzoz.pdf
    • https://cdn-cms.f-static.net/uploads/4529087/normal_6054fb3cabe32.pdf
    • https://cdn-cms.f-static.net/uploads/4492281/normal_606e497820e79.pdf
    • https://bidumijedurazi.weebly.com/uploads/1/3/1/4/131437194/naxiwalavuso_rabovitusu_pubipemijunu_putasesugow.pdf
    • https://jafobepajimo.weebly.com/uploads/1/3/4/8/134881918/zesivefovuvozi.pdf
    • https://cdn-cms.f-static.net/uploads/4529697/normal_604307ac8f0de.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/82fe5928-6b71-4a0c-be72-d154fd781684/instrucciones_para_hacer_manualidades_con_material_reciclable.pdf
    • https://uploads.strikinglycdn.com/files/965d5b8a-99d5-4cd6-9970-29ecc8868400/41744700296.pdf
    • https://uploads.strikinglycdn.com/files/d3077acc-378a-4f9f-b95c-68a10e71b006/how_to_design_a_website_from_scratch_using_wordpress.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd4a.bin
238835e901290ff2803acb0dfd09385966c1a9699be4f170f06f5122af59289c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4A 5392 bytes
font_01_sfnt_off00010f89.bin
8343d8b040a5b7f8d580367aecbba890e317d83676ef952d54d189abd88525cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F89 11032 bytes