Malicious PDF — malware analysis report

Static analysis result for SHA-256 bccf00c512ee69b8…

MALICIOUS

PDF

80.5 KB Created: 2021-03-06 11:33:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: ef253bdd4d574aa537a0fd28c264519e SHA-1: 0893c0e1e7b98a95d955a86f7563b16cd6828bcc SHA-256: bccf00c512ee69b8b802701e221953b0827732d839deb5ba7899984100b7506c
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as an external URI pointing to 'xajibur.ru'. Heuristics indicate the PDF is a link farm hosted on disposable domains, and ClamAV detection confirms it as a phishing trojan. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous links suggests an attempt to redirect the user to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://xajibur.ru/wix?keyword=5+way+pvc+fitting+1+1%252F4 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378170/normal_6040ae6708063.pdfIn PDF document text
    • http://nadipewin.mywebcommunity.org/dowopudojufuzifijiwunelo.pdfIn PDF document text
    • http://xizesagig.iblogger.org/visit_card_template_word.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421778/normal_60183ebe3c316.pdfIn PDF document text
    • http://nijaxubazaziw.mypressonline.com/nibewedebasug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464878/normal_6018a022e9417.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389582/normal_60059967dea51.pdfIn PDF document text
    • http://tipofeliluget.medianewsonline.com/97585078516.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419654/normal_601d260ba8183.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/kagajepegabeb.pdfIn PDF document text
    • http://timinome.getenjoyment.net/bow_tie_cinemas_movies_reston.pdfIn PDF document text
    • http://laregazobo.22web.org/suruvijuburezikufugevire.pdfIn PDF document text
    • http://bukuminuwakub.mypressonline.com/mabiretinobub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://genenapukiral.epizy.com/jaxenixalexukugap.pdfIn PDF document text
    • http://ruwabegaxiz.epizy.com/39490837439.pdfIn PDF document text
    • http://fikuputo.epizy.com/arangetra_velai_video_songs.pdfIn PDF document text
    • https://b1c30c75-ab46-439a-884d-3836ae4b8a49.filesusr.com/ugd/2d1648_55f4af33e93a45d38e9bee7b4cfb5947.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/82212394855.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/pakistan_baitulmal_form_pakistan_sweet_home.pdfIn PDF document text
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_ca3410b57c9f43e299136d20f1791c04.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA8 5336 bytes
SHA-256: ee6664fb2233008fcdf309828efcb267b62fde3506d34c174076b94c8abc4c30
font_01_sfnt_off00011224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11224 10240 bytes
SHA-256: cb8dc9bfab5f9e1d98158a0e447571a665097ee71853c37d689354d9a6e078d3

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