Malicious PDF — malware analysis report

Static analysis result for SHA-256 512bfe5e5bbce2b0…

MALICIOUS

PDF

76.4 KB Created: 2021-05-04 12:21:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9ed00428011413f06bdd999cf2b61166 SHA-1: 788af0ca300e7568e066b7442429632b43238754 SHA-256: 512bfe5e5bbce2b0c2c8101b77bb91bac343dc6bba237413aeb107d0d08e1c3b
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external links, including one to 'baarspo.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, likely to obscure the malicious intent.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://baarspo.ru/strik?utm_term=golf+buddy+voice+2+change+battery PDF link annotation
    • http://moxupasasitote.mywebcommunity.org/birlemi_milletler_deniz_hukuku_szlemesi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470960/normal_5fccda3d537d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495839/normal_605d1b1434371.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501962/normal_5fcabafc5c4ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464070/normal_601b14024a4b4.pdfIn PDF document text
    • http://bovewitavivebu.getenjoyment.net/takebelabubolu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479226/normal_5fd8d01986a5f.pdfIn PDF document text
    • http://kopogaxepaku.sportsontheweb.net/gebuvejumo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370764/normal_60555040b9df1.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/penefelomiju/anggota_autobots_transformers_4.pdfIn PDF document text
    • https://62abf401-5fc9-4991-ac00-cb6a0c8cf8ec.filesusr.com/ugd/e4ff69_8d307f7ac10c47d5a25794a3cbf280ee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sitozi/fractions_decimals_and_percentages_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/how_to_say_thanks_for_the_feedback.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/best_investment_for_beginners_uk.pdfIn PDF document text
    • https://631ffb88-cf2d-4844-8d6b-9338a1b21cc5.filesusr.com/ugd/d24e6f_2b4b5bbcb0aa4b68a71ab77d5f0b2311.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/magntophone_uher_4000_report.pdfIn PDF document text
    • http://supajiwa.myartsonline.com/sezozuguwudofag.pdfIn PDF document text
    • https://c5c27394-2042-4749-9b39-d1c24dcbd9f0.filesusr.com/ugd/e9b987_5387b56edfa74b5f8ff7db77a7849a6d.pdf?index=trueIn PDF document text
    • http://viwuwijagabote.myartsonline.com/56709056383.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_off0000ea64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA64 5572 bytes
SHA-256: 4864f645334063d03dc7d2d902742b747e293a1b5a71c9cff2a6ebfebf27e2f0
font_01_sfnt_off0000fd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD64 11608 bytes
SHA-256: ed8ad99042a8a45157f3bbdd513bdb3635b22456472e7b6e883f70f4af604dc7

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