Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed8caca1056e9587…

MALICIOUS

PDF

105.3 KB Created: 2021-04-30 23:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 8e13fc73a93b38a264e92a1b7a32cd86 SHA-1: 5b02a0c48c4b041011b61828b622f1fc0b999409 SHA-256: ed8caca1056e958743112e374a95628eb4ad1c775d1b5472435ded6002dfa3d8
126 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous embedded URLs, many of which are associated with link farms and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and the link farm heuristic suggest the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://bologen.ru/strik?utm_term=lowrance+elite+5+dsi+operation+manual PDF link annotation
    • http://tarenutufitox.66ghz.com/erbitux_package_insert.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379720/normal_6026e7bc6d60c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490519/normal_601d5d420137c.pdfIn PDF document text
    • http://wopexobow.mywebcommunity.org/add_text_box_to_document.pdfIn PDF document text
    • http://uscreditmonitoring.info/28281137477r4qfo.pdfIn PDF document text
    • http://hihikane.space/36762879600e0h0z.pdfIn PDF document text
    • http://kitafoged.medianewsonline.com/fipokomiwib.pdfIn PDF document text
    • http://nickned.me/diarios_de_motocicleta_subtitulada_en_espaoltznuq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472491/normal_60379ac35d363.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://19eae752-0dc2-40b2-988a-3ead9c543f91.filesusr.com/ugd/dee0a8_dc72cceae6b64653825323aba9dce16c.pdf?index=trueIn PDF document text
    • http://bibirosomuxir.epizy.com/28285630022.pdfIn PDF document text
    • http://lijomoxanegug.rf.gd/39664724255.pdfIn PDF document text
    • https://68fdcf0a-b1f0-4758-9edf-48d2be6d990b.filesusr.com/ugd/ac51ce_9e8f3f067bf6487585031639210583d1.pdf?index=trueIn PDF document text
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_5ffc0cba4d854ffd8319a3a8d39e088a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zetituri/xesotumigodobexanuzetape.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/lofekujedeli.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/8217833766.pdfIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_6260cf197f974dc28b8a60a9da546a83.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/apple_a1392_airplay_2.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_off00015317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15317 5376 bytes
SHA-256: 65df90c4925042ae951a8c4f3041ebed5c2f5a9ced52c1c29ae319b9488c5376
font_01_sfnt_off0001655d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1655D 2388 bytes
SHA-256: 391de6d749f7e6e1354d7f1b3ca9f4980e51c6069a045d9f2087d99de7ae6e88
font_02_sfnt_off00016fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FB0 11644 bytes
SHA-256: b1c2fbdafe8908189fffc6c354c7710327b25cc81d6b43b8874f401cf48064e5

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