Malicious PDF — malware analysis report

Static analysis result for SHA-256 839b3dd7e0f2db72…

MALICIOUS

PDF

75.1 KB Created: 2021-02-12 16:32:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3a47b92026dbda41cfb825127b68d489 SHA-1: 8b947e8775279901057195d22591f031ab56a785 SHA-256: 839b3dd7e0f2db720db52035df6636fabd20ac197c6b47b62cd92127bef4c02b
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable or suspicious domains, suggesting a link farm or redirection scheme. The ML classifier strongly indicated maliciousness, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the suspicious nature of the embedded links. While no scripts were directly extracted, the presence of many external links suggests a potential for downloading further payloads or redirecting to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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/wb?keyword=algoritmo%20acls%20pdf PDF link annotation
    • https://tisavivo.weebly.com/uploads/1/3/4/0/134040567/2068843.pdfIn PDF document text
    • http://zifujujefilat.iblogger.org/65273764947.pdfIn PDF document text
    • https://kifeketefisub.weebly.com/uploads/1/3/5/3/135347095/2db0ce68adaa875.pdfIn PDF document text
    • https://funopazotasar.weebly.com/uploads/1/3/1/0/131070342/b804e03a32.pdfIn PDF document text
    • http://summ-green.fun/22259083376yxzvs.pdfIn PDF document text
    • https://kowadesilokawu.weebly.com/uploads/1/3/4/2/134265693/ludobozovuwamo.pdfIn PDF document text
    • http://salonvarna.com/toolbox_for_minecraft_pe_premium_modhxb0u.pdfIn PDF document text
    • http://connexion-amelii.xyz/roxowawexosejonu539pj.pdfIn PDF document text
    • http://xugerovogubex.22web.org/2064526641.pdfIn PDF document text
    • http://spainsale.pro/65299293836i007f.pdfIn PDF document text
    • http://ijmalan.xyz/megexasasuruxak1m7i.pdfIn PDF document text
    • http://all-gopro.com/suwimivogukalelzkge.pdfIn PDF document text
    • http://datujizid.iblogger.org/new_amharic_protestant_mezmur.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/xamibebulosaxug/23907878024.pdfIn PDF document text
    • http://digifasofow.rf.gd/jetset_diaries_size_guide.pdfIn PDF document text
    • http://tunowik.epizy.com/nimimevuna.pdfIn PDF document text
    • http://fasokefukolu.epizy.com/calcul_de_moyenne_avec_coefficient_excel.pdfIn PDF document text
    • http://wanukunu.epizy.com/8439437474.pdfIn PDF document text
    • http://zubixuguse.epizy.com/50093682577.pdfIn PDF document text
    • http://vulikoviluxugu.rf.gd/bestwap_video_song_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/56148849971.pdfIn PDF document text
    • https://s3.amazonaws.com/lopeteb/ruraletezezumoj.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/58778976229.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_off0000e4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D9 5464 bytes
SHA-256: b92626a6a486204d4c54ec47cfb355738db8722a2e157192f4efdb2b7e783233
font_01_sfnt_off0000f755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF755 11820 bytes
SHA-256: 31b7a43514a2bf5f3678cf65c3ef63c59b5db0d9f8b4e1095ab7ceb3824ad292

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