Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1855e369efb2deb…

MALICIOUS

PDF

76.1 KB Created: 2021-03-22 03:41:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: af28586845c10a7ae0fb9f4fba20374b SHA-1: a005063d47f91403da65da432c133b200e5bc0ef SHA-256: c1855e369efb2debeff79acc2238f7c15dcf22059fa51daade8501d10ad7258d
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and the overall structure suggest the document is a lure to drive traffic to malicious sites.

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://maypoin.ru/strik?utm_term=how+do+i+change+my+tv+input+without+a+remote PDF link annotation
    • https://zidovularirijap.weebly.com/uploads/1/3/4/7/134718784/nagobatalura.pdfIn PDF document text
    • https://rasiguxi.weebly.com/uploads/1/3/5/3/135314707/zuwujalevabunuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405185/normal_5fcbf9f7ef54b.pdfIn PDF document text
    • http://didibemez.scienceontheweb.net/21913661621.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/lhdcThb/block_city_wars_game_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368975/normal_5ff40148be4f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410965/normal_5fe66393b888c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386829/normal_60074b6a0776f.pdfIn PDF document text
    • https://nufapapezo.weebly.com/uploads/1/3/0/9/130969462/lidarila-mevotenefug-nabuvewi.pdfIn PDF document text
    • http://felagem.getenjoyment.net/4359152408.pdfIn PDF document text
    • https://gutazalofekeva.weebly.com/uploads/1/3/5/3/135395177/1163975.pdfIn PDF document text
    • https://cdn.sqhk.co/liminekaj/eGgdgiu/kigiwoxizigulugub.pdfIn PDF document text
    • https://cdn.sqhk.co/nosimasiv/cigGMf4/touch_the_monkey_song_animaniacs.pdfIn PDF document text
    • http://zakosemej.mypressonline.com/athlean_x_inferno_max_shred_workout.pdfIn PDF document text
    • http://gekodejevotug.medianewsonline.com/big_green_egg_accessories_must_have.pdfIn PDF document text
    • https://doliwejivus.weebly.com/uploads/1/3/4/3/134353379/6dd3bbec39f39.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc9f4b0a-593a-4a96-8f48-3fe8684489f4/lasok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f20dd134-6a31-4e18-bf8d-0f0f6f01e3fc/ti_89_titanium_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef6b3c2d-819d-450f-9c83-a6ee37aa2e9b/u8_smart_watch_battery_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf22fc9f-fdf5-45f6-adf4-d1e2d961272f/vizio_e400i-b2_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54f348b8-4300-4529-bef0-19ea65e55e0b/amar_chitra_katha_complete_collection_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05c41d25-a2b6-482d-a857-0760c2966f50/60633859409.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_off0000ebfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFD 5492 bytes
SHA-256: 9416ba04460984ed8532fb6d0d7bd3b7784f9c8c45601bfa8c33e49f07fa6826
font_01_sfnt_off0000fea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA1 10452 bytes
SHA-256: 6c2aa073ab5eb249344436bfc3eb6f69f85bce9227f2f8af8ca5a54e36839782