Malicious PDF — malware analysis report

Static analysis result for SHA-256 643a81870d889b57…

MALICIOUS

PDF

75.4 KB Created: 2021-04-01 07:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1775100388955b0cfacf3ef5dff94529 SHA-1: 985f33b16f8afc4bb672a4e2fda46efbdcc2c493 SHA-256: 643a81870d889b57ca9a9567df7ab944cd439306ea26abaebeeef71f16d0b56b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it is designed to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://druttle.ru/strik?utm_term=fisher+price+rock%2527n+play+sleeper+replacement+auto+rocker+motor
    • http://zozagemidifisep.22web.org/21977974769.pdf
    • http://xasanefajisa.sportsontheweb.net/wisisatarelewifelumo.pdf
    • https://lebotowim.weebly.com/uploads/1/3/1/4/131438344/5161640.pdf
    • http://fukuzowi.sportsontheweb.net/40219661848.pdf
    • https://kikebepuziji.weebly.com/uploads/1/3/0/7/130775256/tegofevox.pdf
    • http://pestore.pro/pafesan23yhs.pdf
    • http://luxisulejoxo.getenjoyment.net/bushnell_neo_ghost_bag_clip.pdf
    • http://lojapidabud.mypressonline.com/tu_puedes_sanar_tu_vida_de_louise_l._hay.pdf
    • http://xofitazuregokud.mywebcommunity.org/jimuserodev.pdf
    • http://tokiridevifo.medianewsonline.com/az_900_study_guide.pdf
    • http://myfoxing.online/99484652360t3grf.pdf
    • http://tuzirawejaw.mypressonline.com/85744134327.pdf
    • http://mejumafegebameg.mygamesonline.org/blender_car_modeling_tutorial.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://bokepomi.onlinewebshop.net/72627777389.pdf
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_50cf642189bc473c8261302d40cd02a1.pdf?index=true
    • http://budunasetixap.epizy.com/blue_label_telecoms_ltd_annual_report_2017.pdf
    • https://d9bc9112-e8db-454b-af0e-45d3b538737f.filesusr.com/ugd/1d3654_31c2acdc087a4c3c80455cd6ba7be61c.pdf?index=true
    • http://modefumagija.epizy.com/jidunabirezuzalovonuxo.pdf
    • http://ninotabud.epizy.com/relative_dating_methods.pdf
    • https://850a1920-2731-4717-9c72-6fe6783ae8b2.filesusr.com/ugd/2d1648_fca42bb1bbad44a7ad398efb4972d3a9.pdf?index=true
    • https://8a7e94d2-1b07-4399-8a7b-cfebf1eb419e.filesusr.com/ugd/e78b77_60b506520ed94402a10e3a95afa31da2.pdf?index=true
    • http://jofikuv.atwebpages.com/49468818615.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9b1.bin
09c4c04f60ceb3bdc0eef3ba9bb09bf59eb8f13a69960b37af147386c8be214b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B1 5212 bytes
font_01_sfnt_off0000eb3f.bin
8561accbb42fb0a2b56c13d8362a5914ab3df72498f1b538bd254cd8240d95a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3F 11156 bytes
font_02_sfnt_off00011143.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11143 4324 bytes

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