Malicious PDF — malware analysis report

Static analysis result for SHA-256 877e5854c0252e24…

MALICIOUS

PDF

73.9 KB Created: 2021-03-30 01:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 96b3b009384a4f0e9a81cce3be9bf9ff SHA-1: 965f95e7f9907d074150654200c3a81bc386dc36 SHA-256: 877e5854c0252e245a814cb419afbb1155e7dbe6203ac26abed77a1514b65332
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs that point to domains associated with link farms and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://midufefew.ru/award?keyword=algorithme+g%25C3%25A9n%25C3%25A9tique+matlab+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420454/normal_5fd632fcdb665.pdfIn PDF document text
    • http://lololoj.sportsontheweb.net/60562372128.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477164/normal_5fec491a11c0c.pdfIn PDF document text
    • http://kunewalijaxuna.getenjoyment.net/rolling_stone_magazine_s_500_greatest_songs_of_all_time.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496225/normal_60565add2027f.pdfIn PDF document text
    • http://kixalilabuzawov.medianewsonline.com/aikido_martial_arts_techniques.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470679/normal_5fff8393ba747.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494677/normal_5ffd1e70e7ce3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486356/normal_6025ab52d7028.pdfIn PDF document text
    • http://rekijiwowak.scienceontheweb.net/asuhan_keperawatan_hepatoma.pdfIn PDF document text
    • http://xazapefunel.getenjoyment.net/kopawinemisa.pdfIn PDF document text
    • http://kajipim.mypressonline.com/what_are_the_7_principles_of_communication.pdfIn PDF document text
    • http://fibutogu.mywebcommunity.org/molecular_microbiology_laboratory.pdfIn PDF document text
    • http://fakexexu.sportsontheweb.net/julelinefabubipugerada.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4504788/normal_5fe3a6a2293d1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ae1c7fb-ca92-4d91-9c08-65bae4325654/tascam_dr40_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/415300e8-6368-44e3-aab0-0e1a9d8cff1d/19104111927.pdfIn PDF document text
    • http://xurosuforudev.atwebpages.com/biology_questions_for_rrb_ntpc.pdfIn PDF document text
    • https://ac65beef-1c88-4b01-a948-251493ed82f2.filesusr.com/ugd/09857b_7e8f22a59d0e4977a41889b2f85273a9.pdf?index=trueIn PDF document text
    • https://cc652f91-b1ab-470c-b36f-46d838ef85b2.filesusr.com/ugd/fbccce_5004fed3ebc449e2a33e96bfa1237ed8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/10c4342b-42f9-4ed9-a47f-35eab4dd4fe8/how_to_say_thank_you_lord_in_french.pdfIn PDF document text
    • https://878ee1be-828d-48b9-a24a-84283cf66a1c.filesusr.com/ugd/86936c_cfb31fedb9b04947bbcd0324e369c087.pdf?index=trueIn PDF document text
    • http://zimopup.myartsonline.com/tiwetivanutiw.pdfIn PDF document text
    • https://0b7b936c-93ac-4a60-9644-6ba220b934cc.filesusr.com/ugd/b4bf80_12c3791d6d044b70bb86d8d488d098c6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/516515a8-2213-47b5-86ec-50097b86fbdb/89579477948.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_off0000de80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE80 5676 bytes
SHA-256: a8ef6d110d705556eb79f06c8b04b49865b82cc68c725ddb1f1168481395457e
font_01_sfnt_off0000f14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14E 12132 bytes
SHA-256: 5a328cba0c34539e0090eeadd4beeda3c7cb0a39b07c9ad21dfe843b4ad5a700