Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6353c5b25b12794…

MALICIOUS

PDF

80.6 KB Created: 2021-04-11 05:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5eabb268e268bc5d98d6e5039f75d2be SHA-1: af6eff23000d01860b25ec111ad5626799b2ade0 SHA-256: b6353c5b25b12794d015424aa2e5a319adc7139802a9e7ee61105c13a5caf8a7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://pelibifir.ru/strik?utm_term=instrumentos+para+recolectar+datos+estadisticos PDF link annotation
    • http://pujipaxubeko.22web.org/akuntansi_biaya_gratis.pdfIn PDF document text
    • http://aycotoro0.xyz/how_much_do_merchant_navy_earnkzr4h.pdfIn PDF document text
    • http://vitrinachel.ru/what_is_solution_focused_group_therapyzyfpy.pdfIn PDF document text
    • http://amst-watch-v1.club/ap_calculus_limitsqbjkr.pdfIn PDF document text
    • http://zunewibozoxug.iblogger.org/62251464364.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390638/normal_5feb1a4d27f59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420018/normal_606bceb85a03f.pdfIn PDF document text
    • http://megaliwuxo.22web.org/burmese_days_summary.pdfIn PDF document text
    • http://lazirog.mywebcommunity.org/5000219685.pdfIn PDF document text
    • http://susurrus.space/makepeburesolt.pdfIn PDF document text
    • http://shop-onlinediscount.xyz/dentex_apk_download_latest_version3kwzb.pdfIn PDF document text
    • http://tibudirowe.mygamesonline.org/11691256446.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/5fbdffe8-c5ec-42f9-8314-107b1370c7ee/room_booking_software_australia.pdfIn PDF document text
    • http://jikusona.rf.gd/enterprise_application_architecture_patterns.pdfIn PDF document text
    • http://kofufinaniba.rf.gd/atropine_davis.pdfIn PDF document text
    • http://tukapitolok.rf.gd/47655918198.pdfIn PDF document text
    • http://zimemotom.rf.gd/10749803924.pdfIn PDF document text
    • http://lugivodunoxasi.atwebpages.com/48083308259.pdfIn PDF document text
    • http://lawaxisagiwog.atwebpages.com/how_to_tell_which_graph_to_use_for_database.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea5d26a0-afaf-4ba5-94e6-d75cddb7fc5d/india_latest_news_today_in_hindi.pdfIn PDF document text
    • http://kiroxivox.epizy.com/savilewuwexaberofobuto.pdfIn PDF document text
    • http://logiweliziweje.onlinewebshop.net/2015_washington_redskins_cheerleaders_roster.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDD 5036 bytes
SHA-256: d2c7330f0788589c0136699ecff2bf382514969b828523c270bc604bc963c973
font_01_sfnt_off0000fcd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD1 12276 bytes
SHA-256: 6516a2db01f2201d93f6e19e0a8e361d45cffcae3567f7bebb8adafc3e7305da
font_02_sfnt_off000124b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B4 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e