Malicious PDF — malware analysis report

Static analysis result for SHA-256 81456bf25cec47a4…

MALICIOUS

PDF

80.5 KB Created: 2021-03-28 19:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: da1c263b92dd6951d6c5c4d1dfff8d4b SHA-1: 7ae7cb811514c45f81b94740686d81c437ef242c SHA-256: 81456bf25cec47a4eb75b4a40d9516c7cd6f825075960e5565b33426d80084a4
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a high-confidence heuristic indicating it's a phishing lure, redirecting users to a suspicious URL. The ML classifier and ClamAV detection further support its malicious nature. The embedded URL is likely used to host a phishing page or download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://fokemale.ru/strik?utm_term=love+is+a+fallacy+by+max+shulman+tagalog PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368266/normal_6025025c4118b.pdfIn PDF document text
    • http://fapuditutatinu.iblogger.org/hormonas_del_sistema_endocrino_y_sus_funciones.pdfIn PDF document text
    • http://it50disconto.info/21757220356wxhqv.pdfIn PDF document text
    • http://cleaner360.shop/how_to_get_rid_of_stinky_feet_permanentlykws3w.pdfIn PDF document text
    • http://goldenframecollision.com/realtek_network_drivers_windows_10vaasl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505771/normal_605f5efb0762b.pdfIn PDF document text
    • http://sdfsdfsdf.shaketorch.com/wd_my_cloud_mirror_raid_setup.pdfIn PDF document text
    • http://springtea.space/60822800707ditcg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497358/normal_5fcb0b53838f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378164/normal_60492291dabbb.pdfIn PDF document text
    • http://originalhallyu.com/pilixopebenavafzgy7.pdfIn PDF document text
    • http://maddot.space/congenital_toxoplasmosis_aap_guidelinesrgh5c.pdfIn PDF document text
    • http://ndfnasg.xyz/vintage_band_t_shirts_for_saleh379e.pdfIn PDF document text
    • http://mexicotop.xyz/what_is_mep_shop_drawingsdfacd.pdfIn PDF document text
    • http://item-mask.top/ipega_pg-9023_wireless_bluetooth_game_controller8xuq5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zewivijususilub.epizy.com/calendar_january_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/honda_hrx217k5vka_lowes.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/arya_audio_songs_come_ing.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/34457864151.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/vajuwokunibu.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/xawizajomesobagukupet.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/uscis_immigrant_fee_payment_guide.pdfIn PDF document text
    • http://lolowavedipugis.rf.gd/jifenusatomakevedap.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/metformin_tablets_bp_500mg_side_effects.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/50405081548.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/if_ecg_report_is_normal.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_off0000fd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD69 5512 bytes
SHA-256: 7b369af059431750e7ff9b8639f1d21ea20ac71ad15ccc6edd39e0dce9e53826
font_01_sfnt_off00011022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11022 10584 bytes
SHA-256: 67ffd1d2e1b190514d89b17d6b72636194b71c0d0cab971fe2b1c10b3334dd6e

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