Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed8a919f0c9b2dc2…

MALICIOUS

PDF

74.2 KB Created: 2021-03-03 21:03:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: d1c4c4b0e3a1804b72fbcec352641657 SHA-1: 9a501297bd4f736a5e5b88cdb91af7e443a49a63 SHA-256: ed8a919f0c9b2dc2e75f6032f9c204a5d84b3f4b94092b14d6e1e6219687b465
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs point to various PDF documents, likely serving as lures or redirects to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/award?keyword=ti+nspire+cx+cas+emulator+mac PDF link annotation
    • https://cdn.sqhk.co/kitujesijak/jhid0ZI/best_romance_books_2019_uk.pdfIn PDF document text
    • https://dopotalufiru.weebly.com/uploads/1/3/4/6/134601398/5842647.pdfIn PDF document text
    • http://sehq.xyz/about_last_night_imdb_parents_guide3xy7e.pdfIn PDF document text
    • https://mujolimu.weebly.com/uploads/1/3/4/8/134868529/gafiwomofesebuda.pdfIn PDF document text
    • https://tunedewujanan.weebly.com/uploads/1/3/5/3/135345761/5c8f10e4.pdfIn PDF document text
    • http://stopnutristrike.ru/alimentacion_en_el_embarazo_oms8vkdv.pdfIn PDF document text
    • https://vujebitaj.weebly.com/uploads/1/3/4/7/134759162/repevokezawe.pdfIn PDF document text
    • https://cdn.sqhk.co/korebuxaguz/jaiegfH/zuvukawakatavalanibuli.pdfIn PDF document text
    • https://taxufutusa.weebly.com/uploads/1/3/4/5/134514166/dufumudekimob-bidisiguvi-zogonizamis.pdfIn PDF document text
    • https://lijepaxo.weebly.com/uploads/1/3/5/3/135324298/4432390.pdfIn PDF document text
    • https://cdn.sqhk.co/pazaxefuma/jdFApib/boluzalevowire.pdfIn PDF document text
    • https://bitipobigexu.weebly.com/uploads/1/3/5/3/135399459/5377127.pdfIn PDF document text
    • https://cdn.sqhk.co/kurinunuwor/7QghsoI/40995780421.pdfIn PDF document text
    • http://tuwukadinem.mygamesonline.org/a_first_look_at_communication_theory_10th_edition_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jimevexir/gjG2ibL/66427423822.pdfIn PDF document text
    • http://vikiduxa.mywebcommunity.org/multiple_linkage_model_explained.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/WKgcigf/1578894263.pdfIn PDF document text
    • https://vokubopupabilu.weebly.com/uploads/1/3/4/6/134691430/jedus.pdfIn PDF document text
    • https://cdn.sqhk.co/guludagew/wjvfhaP/become_a_teacher_s_assistant_nyc.pdfIn PDF document text
    • https://cdn.sqhk.co/gexedamej/icJhejg/ted_cruz_height_and_weight.pdfIn PDF document text
    • http://reabook.online/free_business_brochure_design_templateshcfal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xijewixevav.onlinewebshop.net/zopupa.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_off0000e698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE698 5096 bytes
SHA-256: 7626471d34abdddff4d332ca254a1d2d93633b2da38836df6f6433e0164b5936
font_01_sfnt_off0000f7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DA 10484 bytes
SHA-256: d4dc943e1af706d55593c9f39dc008ab6ebbc46dbfa1bdab53b94b6588cbf453

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