Malicious PDF — malware analysis report

Static analysis result for SHA-256 77bf067527286a0d…

MALICIOUS

PDF

90.1 KB Created: 2021-05-11 09:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 0842fa0310c7a6b598592af74f6d08d3 SHA-1: a0d715fd8573bfec43ca3e6b2494d7470288dd2a SHA-256: 77bf067527286a0d646c89a4e62e22aa281f6649576ea5d1827f96f5fbbff050
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 pointing to disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the nature of the link farm suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://mezovuduw.ru/strik?utm_term=feliz+navidad+jose+feliciano+feat+fawijo+letra PDF link annotation
    • https://cdn.sqhk.co/zimuteraf/U7hhngg/wazezosuxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485329/normal_5fdba1eced3a1.pdfIn PDF document text
    • http://gikizevububem.22web.org/24201956553.pdfIn PDF document text
    • https://cdn.sqhk.co/sevigexew/hggh8Zh/nususapokire.pdfIn PDF document text
    • https://cdn.sqhk.co/folikulezig/MjchhIF/aarengum_thanuranga_video_song_free.pdfIn PDF document text
    • http://testvvd.xyz/famous_english_short_storiesuiqq6.pdfIn PDF document text
    • https://cdn.sqhk.co/firavibaw/rhjiiif/fresh_fruit_juice_maker.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478664/normal_604f43ab4a1da.pdfIn PDF document text
    • https://cdn.sqhk.co/bizujonad/igjalyj/27184754710.pdfIn PDF document text
    • https://cdn.sqhk.co/fezivabuja/id3hghd/90567070946.pdfIn PDF document text
    • http://my-favshopd.online/classifying_polynomialsjsfzq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472494/normal_60465826d3d97.pdfIn PDF document text
    • http://subexadedesu.iblogger.org/nubedawelak.pdfIn PDF document text
    • http://ca-manalapan.space/bird_feeder_plans_freem1ms8.pdfIn PDF document text
    • https://cdn.sqhk.co/parikozug/cjhGfjb/mizekov.pdfIn PDF document text
    • http://dress-russia.ru/lord_of_the_flies_simon_character_analysis_chapter_1oqowv.pdfIn PDF document text
    • https://cdn.sqhk.co/pozazoji/lgeSjdd/79524355553.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
    • https://5b3fc17b-a4fb-4144-9a53-ff617e35bc6a.filesusr.com/ugd/696117_fdbd13fa3be4465b9edb262d9f7aad46.pdf?index=trueIn PDF document text
    • http://zopukugabem.rf.gd/jiteserakoxolotinimu.pdfIn PDF document text
    • https://0e733887-fd72-4d21-8b10-0a39cafbc931.filesusr.com/ugd/1e4d10_2716963fa7bd421ab6f844b23c7c3a51.pdf?index=trueIn PDF document text
    • http://xisebekixow.epizy.com/kujurid.pdfIn PDF document text
    • http://tononevujibux.epizy.com/57470951333.pdfIn PDF document text
    • https://a2c67b61-a01d-4053-b7ad-f1487bca8054.filesusr.com/ugd/24853a_365165c3329244eba1b32885067681b6.pdf?index=trueIn PDF document text
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_3928985f07794d84b84ff5bc3dbaf406.pdf?index=trueIn PDF document text
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_cb0ece8da943436ba159b5c7f890735f.pdf?index=trueIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE62 3952 bytes
SHA-256: 70238cdfb1d7c72185872a8da2063da1b0e9f87bf1821451f1c62334685248ee
font_01_sfnt_off00010c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6F 5036 bytes
SHA-256: a4f4f806221acca6d7b5b97ac9a541f6311ccbae1a12b41bed4d30e762ce1254
font_02_sfnt_off00011db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB9 14696 bytes
SHA-256: 6cfd2be959db87263d022c39f81f3411821061fee76df7c0e437a785f8bc1d8f
font_03_sfnt_off000149f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149F5 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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