Malicious PDF — malware analysis report

Static analysis result for SHA-256 840b1bfa67665ec5…

MALICIOUS

PDF

65.4 KB Created: 2021-02-19 22:29:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 545290087468ccc850ed1bbf480e183b SHA-1: 95229e9a8c64414f9f5c959315b6fe264afc0393 SHA-256: 840b1bfa67665ec599a95eed11144b9f69674000d51440b16fcbfc0b4d8178c1
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/123?utm_term=identidades+trigonometricas+pdf+julioprofe PDF link annotation
    • http://quickstore.pro/zugelajufotaxowunuvufsyant.pdfIn PDF document text
    • https://cdn.sqhk.co/tewisifupib/a2sNij8/silverwood_theme_park_job_application.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456165/normal_5fd15e274f4c8.pdfIn PDF document text
    • https://dezijetide.weebly.com/uploads/1/3/4/8/134864221/197162b50.pdfIn PDF document text
    • https://cdn.sqhk.co/fafojipedul/EhfGic3/21399237338.pdfIn PDF document text
    • http://ig-mediateam.net/is_nioh_harder_than_dark_soulsmdmue.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421770/normal_5fe6d59786e73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365563/normal_5ff5b72a44618.pdfIn PDF document text
    • https://cdn.sqhk.co/lilovenodi/gigjcmh/3_mystery_words_answers_level_16.pdfIn PDF document text
    • http://meetsalle.xyz/kelobunaxlf598.pdfIn PDF document text
    • https://dopubitiru.weebly.com/uploads/1/3/0/7/130776304/xirakaxupamoxogeliv.pdfIn PDF document text
    • http://ses-sanobrabotka.ru/best_dance_in_india_2020b3eb8.pdfIn PDF document text
    • https://ludolukek.weebly.com/uploads/1/3/4/6/134699908/liwut.pdfIn PDF document text
    • https://cdn.sqhk.co/videgogaf/8CpkGpp/nearest_old_national_bank_near_me.pdfIn PDF document text
    • http://reduslimer.website/minecraft_pc_free_1._14._4ouk7z.pdfIn PDF document text
    • http://granitmetrospecstroy.ru/85170603324s8qhq.pdfIn PDF document text
    • https://pupupobinizoto.weebly.com/uploads/1/3/1/3/131384436/mugububi-tewamitu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/united_nations_convention_on_biological_diversity.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC34C 5488 bytes
SHA-256: 431d615dee57ab88be50165b86ed196e13f1c5b4330026f23ab7286e83c6a3ff
font_01_sfnt_off0000d5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EC 10072 bytes
SHA-256: b1ebfb26075e7e0df331544b0a405a10ec4755c1bed16d6807335a70cacf0b70

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