Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd724cf0d3d5aec5…

MALICIOUS

PDF

84.6 KB Created: 2021-05-11 16:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 76e658cb8598cf4a2301307db66f8e2f SHA-1: df8fb9d115558caf908cd4eaea4cf7b3c9b72685 SHA-256: cd724cf0d3d5aec587bd31fff22cff6e8b119122a7398c49345729bcba3000df
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary one leading to a suspicious domain that appears to be a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://xezojetit.ru/strik?utm_term=whirlpool+wrf535smbm00+filter PDF link annotation
    • http://jebebixazonutug.mypressonline.com/mewajo.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/hibTNtg/molotuzijididewozopesaxig.pdfIn PDF document text
    • http://kulokozataxat.22web.org/zanifek.pdfIn PDF document text
    • http://fajujefa.getenjoyment.net/ccna_ting_vit.pdfIn PDF document text
    • https://cdn.sqhk.co/jujirepak/jjgiaja/88799464411.pdfIn PDF document text
    • https://cdn.sqhk.co/jigekuragige/Tgdjfih/3663749334.pdfIn PDF document text
    • http://wulodab.iblogger.org/sairat_movie_songs_ming.pdfIn PDF document text
    • http://newonesitel.22web.org/american_airlines_sustainability_report_2017.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wotonopeg.epizy.com/robebid.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/regevujasumelilivodosogu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2009687d-3eb3-425a-b3c7-20f63973c53e/novowe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b60418c-4919-46be-ba79-5d658151d72c/89726920531.pdfIn PDF document text
    • http://kulemekomojiva.epizy.com/balada_de_amor_ao_vento_texto.pdfIn PDF document text
    • http://jigisasamupor.onlinewebshop.net/the_copper_gauntlet_magisterium_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c2de9c8-931c-4630-9b4d-c14817166d93/how_to_reset_danby_dishwasher.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/gunizaleman.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/afasia_infantil.pdfIn PDF document text
    • http://gepikadagutuv.epizy.com/dulilidunidomiwa.pdfIn PDF document text
    • http://losopokatefoxot.rf.gd/principles_of_delegation_of_authority.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/skyrim_guide_book_switch.pdfIn PDF document text
    • http://kenasaxoxaxober.rf.gd/pisufim.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/how_to_create_a_domain_model_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/054ec6a5-e093-4cef-84ea-30334e3689f9/zomavan.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_off00010a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6C 5608 bytes
SHA-256: 2cea76c5cc09c07d1d00b180c6c5d1a928d1d0b7f9de4d74d0e9ff88d6d1326a
font_01_sfnt_off00011d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6F 11768 bytes
SHA-256: 8bfd782c9758e5c172de7d63179ffbc5326902390a705cae3f882f9ec7151b02

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