Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc259d9f9e852620…

MALICIOUS

PDF

79.6 KB Created: 2021-04-07 21:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: d3c8d41062b05039eca6a2d7dbe085c3 SHA-1: cf579fec0de59e6e38ba8a2f0e4b838e9638ac7d SHA-256: fc259d9f9e852620aa7df486eadfd9208e94c896337823d2083343f00bec851b
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or phishing attempt. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a deliberate effort to create a network of links. The presence of a malicious ML classification and ClamAV detection further supports its malicious nature. Although no scripts were extracted, the document's structure and embedded URLs point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://resalured.ru/strik?utm_term=char+broil+tru+infrared+cooking+grates PDF link annotation
    • http://novedexezenel.66ghz.com/58053336852.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzuvazol/shhTrge/daxafitixogitevajigote.pdfIn PDF document text
    • https://cdn.sqhk.co/kipezipilojo/TibheKI/human_resource_management_system_project_in_python.pdfIn PDF document text
    • https://cdn.sqhk.co/jurufovowufu/gD1BAFH/mastercraft_tires_mxt_265_70r17.pdfIn PDF document text
    • https://jugovufepejeja.weebly.com/uploads/1/3/4/6/134611134/tutuverodaraxiv.pdfIn PDF document text
    • https://mepopukivar.weebly.com/uploads/1/3/6/0/136083549/namuzujekiti.pdfIn PDF document text
    • https://nuvawusop.weebly.com/uploads/1/3/5/3/135302159/tisinuw_dibepipi_bopumuvesuze.pdfIn PDF document text
    • https://moredotaze.weebly.com/uploads/1/3/0/7/130776260/9dc3578eef85.pdfIn PDF document text
    • http://wagezofon.iblogger.org/hp_elitedesk_800_g1_twr_ram_upgrade.pdfIn PDF document text
    • https://famojiwogupoj.weebly.com/uploads/1/3/2/3/132303340/resigoguxima-rikigixok-vamolujo.pdfIn PDF document text
    • https://cdn.sqhk.co/nonuripot/Lgejahh/fufigigatewip.pdfIn PDF document text
    • https://cdn.sqhk.co/fikubife/90N5Qib/kadirabijifatibe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_77b5bf82e38b427880eed6a65db5c5d1.pdf?index=trueIn PDF document text
    • http://buvanudune.rf.gd/gedudoxenox.pdfIn PDF document text
    • http://wiwafejopof.epizy.com/vejomemegukimekovijilusi.pdfIn PDF document text
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_151f6bc378c24bd4b401a36f8df56de6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/def76842-3b02-47b1-9751-f8cd17f4deda/tekogawapabaramazarevere.pdfIn PDF document text
    • http://naxilolebepup.epizy.com/how_long_is_howls_moving_castle_book.pdfIn PDF document text
    • https://e3c65705-3664-417e-97b1-2ac29bfab8bd.filesusr.com/ugd/6a5da5_fb4f9c6fef4746e69b6bd0a695923a35.pdf?index=trueIn PDF document text
    • http://nowotaresumoti.epizy.com/76455032045.pdfIn PDF document text
    • https://4dd4a32c-aced-41d2-87e6-7ff9ca8080d7.filesusr.com/ugd/6d6f33_dce0d94f63be4733b14693cb88a9d2b6.pdf?index=trueIn PDF document text
    • http://gapexer.rf.gd/peer_gynt_morning_mood_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9092be4e-6745-45a5-9236-95e859907926/4349270954.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17ea89e1-5cd3-4598-9d8c-be3d8629b46e/how_do_i_update_my_golf_buddy_voice.pdfIn PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_dbdd981cd2044399a7433048a48d1499.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_off0000f5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F1 5392 bytes
SHA-256: 0138692013b1476484750b2a4f26dc0e3877e2ed68408547b619476a0b04727b
font_01_sfnt_off0001083b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083B 12032 bytes
SHA-256: b65042023478a7d6140d2a6c80c6a5b52c027930364ac7de4dd75b914f052876

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