Malicious PDF — malware analysis report

Static analysis result for SHA-256 75cde5f5d82b1fc6…

MALICIOUS

PDF

77.9 KB Created: 2021-03-11 12:47:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a02225feb1974a5996c1782b0e0ded78 SHA-1: 1089c2252f03eecae03c6c392cf25f0cf805cff5 SHA-256: 75cde5f5d82b1fc617b6f6ecd5fb7d875b54b5a02fd7e7185de0eb74942c2270
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 0.9997

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
  • 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://resalured.ru/wix?keyword=cfisd+2019+to+2020+calendar PDF link annotation
    • http://gapagal.mywebcommunity.org/44476471904.pdfIn PDF document text
    • https://toruganaduloxo.weebly.com/uploads/1/3/5/3/135347606/daxerasi_newadavotuxuwoj.pdfIn PDF document text
    • http://lemakomude.sportsontheweb.net/maytag_washer_3000_series_problems_f21.pdfIn PDF document text
    • http://befotuke.mywebcommunity.org/51715965225.pdfIn PDF document text
    • http://rupazaduxil.mywebcommunity.org/fire_and_ice_jewelry_candles.pdfIn PDF document text
    • http://mazoxobiziwikut.iblogger.org/manualidades_con_papel_seda_pompones.pdfIn PDF document text
    • http://mevakimuvu.mypressonline.com/nordictrack_exp_1000_dimensions.pdfIn PDF document text
    • https://xutativapejan.weebly.com/uploads/1/3/4/5/134521393/a97cd6f7fe78.pdfIn PDF document text
    • https://xalifabosivibu.weebly.com/uploads/1/3/0/7/130775217/8250ef70.pdfIn PDF document text
    • http://xepuxupipe.mywebcommunity.org/takobedor.pdfIn PDF document text
    • http://sutixekume.22web.org/3016452745.pdfIn PDF document text
    • http://famozosivupiwij.sportsontheweb.net/basic_aerodynamics_download.pdfIn PDF document text
    • http://renelupalase.22web.org/74759739558.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
    • http://lugifer.onlinewebshop.net/2020_nsw_school_calendar.pdfIn PDF document text
    • http://lugirike.epizy.com/template_ppt_animasi_keren_gratis.pdfIn PDF document text
    • http://vewesefidovif.epizy.com/vidiwumazugijuroxu.pdfIn PDF document text
    • http://bofalonulupujo.rf.gd/what_is_a_rational_behavior.pdfIn PDF document text
    • http://luxupovokajaf.onlinewebshop.net/wupevufudelokejididakun.pdfIn PDF document text
    • http://fidikaxano.myartsonline.com/antagonista_y_agonista_farmacologia.pdfIn PDF document text
    • http://nigowona.rf.gd/hubspot_free_powerpoint_templates.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_off0000e66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66E 5308 bytes
SHA-256: 994321615d5569b1fa9acd104453978fff7ec3f52d74233f2883e8fe69cb9d53
font_01_sfnt_off0000f87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87A 10380 bytes
SHA-256: adc1c43abe908ec58a4c47487763b2cb46c981fb71d22b93f57d01a9f6061081
font_02_sfnt_off00011c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C00 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361