Malicious PDF — malware analysis report

Static analysis result for SHA-256 c25957ba2812e9cb…

MALICIOUS

PDF

75.6 KB Created: 2021-03-09 21:55:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: cc8258a1a499008763b9e9a59fe39f9f SHA-1: 8ecb8f9dde7920012e299edf2e58ae2a725f5c59 SHA-256: c25957ba2812e9cbe08be777977c85366e02f56d678d99858769e865d7923bf4
166 Risk Score

Malware Insights

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

The PDF contains multiple external URLs and is flagged as a link farm on disposable hosting, suggesting a phishing or credential harvesting attempt. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway scanning. Although no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://seumenha.ru/123?utm_term=aadhaar+card+pdf+password+2015 PDF link annotation
    • http://bejisosubonito.sportsontheweb.net/netgear_n600_wireless_dual_band_gigabit_router_review.pdfIn PDF document text
    • http://sweetmeet.online/bedtime_stories_movie_australian_ratingz71c0.pdfIn PDF document text
    • http://genusadnlo.space/metal_gear_solid_revengeance_apk1ugpb.pdfIn PDF document text
    • http://jalojewaga.mypressonline.com/how_to_print_photos_hp_envy_5055.pdfIn PDF document text
    • http://supobesopo.mygamesonline.org/biology_class_11th_ncert_book.pdfIn PDF document text
    • http://vivadoctor.ru/buzegozipomivibvz8ak.pdfIn PDF document text
    • http://tomolijoponix.mypressonline.com/pajovorafopomij.pdfIn PDF document text
    • http://xejopegig.mypressonline.com/45747630995.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/056580d1-88ed-4102-af19-5aa8d98654cf/pegutepajesupetamonurelis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efae63aa-bf7a-42a9-af25-643d83d2f69b/valof.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/welcome_to_lesco_mis_report.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/leveling_guide_dragon_nest_sea.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02f9651e-8ed7-481c-be72-e601da8c4e00/1355619386.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75292ab5-7a15-4f32-93e7-382fb1768548/tipos_de_bombas_hidraulicas_rotativas.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/85561503160.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/what_age_should_you_watch_twilight.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/92346445759.pdfIn PDF document text
    • http://faxiruvud.myartsonline.com/best_slide_in_electric_range_with_warming_drawer.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_off0000de91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE91 5176 bytes
SHA-256: ec892b797c8214695612911a3969feda5f87a469d98344fb68ad572259402293
font_01_sfnt_off0000f049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF049 10244 bytes
SHA-256: 75a83ec6b41b3895a731ad2d5792d5dcf2b41a22b366a6dac142a9651d2f1159
font_02_sfnt_off00011333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11333 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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