Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ef3833b21d7930…

MALICIOUS

PDF

77.8 KB Created: 2021-06-08 21:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e7b03ce7e95fe459f64af21f81ee8a6a SHA-1: 3f1507e42199838b7f2834cf3357eaf1ba773d6c SHA-256: b8ef3833b21d79303cc1716dcc4933afc5fc674d1ee21e3df0d725cba628b11a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://philabc.ru/pbw?utm_term=an+introduction+to+medicinal+chemistry+5th+edition+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495976/normal_605131af71bd3.pdfIn PDF document text
    • https://fuxusololozo.weebly.com/uploads/1/3/1/3/131380606/zoxudovaxe_xadaduv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419846/normal_600e380f476a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385021/normal_60be470503d46.pdfIn PDF document text
    • https://ximesadi.weebly.com/uploads/1/3/0/9/130969353/ziviwegunoxoginen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481409/normal_605f3d3aeeb5d.pdfIn PDF document text
    • https://mitiguranam.weebly.com/uploads/1/3/4/4/134456526/2306ce9121e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450501/normal_5fff520a15ca8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391340/normal_606c64dbac460.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468536/normal_604e9555bf880.pdfIn PDF document text
    • https://suguzavajud.weebly.com/uploads/1/3/4/7/134744383/a62cfbd356b.pdfIn PDF document text
    • https://lofugaliwowutuw.weebly.com/uploads/1/3/5/2/135299309/3354174.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://lufokomarib.pbworks.com/w/file/fetch/144800658/fem_harry_potter_x_voldemort_fanfiction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b186eafb-7cd0-4465-8515-48d94cadd68b/49580960288.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17874e1f-24bd-484c-9ace-7f2041a75560/navataxubumep.pdfIn PDF document text
    • http://wemilamozede.pbworks.com/w/file/fetch/144552567/baby_day_out_full_movie_in_hindi_download_mp4moviez.pdfIn PDF document text
    • http://zanikofepaj.pbworks.com/w/file/fetch/144715125/taco_bell_chicken_fiesta_taco_salad_ingredients.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5f24b99-e63e-45df-bb79-bbc4ec5d388c/kadenazejojud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3ddb8ba-cec8-4719-89f1-35939f4e2b78/focusrite_saffire_pro_40_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70ee6c2f-e989-4fa9-bd96-8c09b4d7f6f5/how_to_measure_speaker_wire_gauge.pdfIn PDF document text
    • http://gaxoxim.pbworks.com/f/sanky_panky_2_hd.pdfIn PDF document text
    • http://fosirodovo.pbworks.com/f/why_is_my_maytag_dishwasher_not_draining.pdfIn PDF document text
    • http://kemuxin.pbworks.com/w/file/fetch/144678615/1888332239.pdfIn PDF document text
    • http://kuzimotum.pbworks.com/f/legosunolotodebezabekola.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_off0000e574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE574 5492 bytes
SHA-256: c0efe4d087cac7752d531ffa49f1b06e0fd3bbfab0cf6d66739f6b69d79a23c5
font_01_sfnt_off0000f7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FA 10336 bytes
SHA-256: aa912c9a484faa7847d74a350c9065988a95b288af93d879dd856d7a30068c58
font_02_sfnt_off00011b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B27 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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