Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b91a22353c9b59…

MALICIOUS

PDF

75.1 KB Created: 2021-03-20 19:29:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d87ba4668aef918d4410a35feb70c022 SHA-1: 8eb0622d9f3813bfe82fe39d2542165f031d8145 SHA-256: d8b91a22353c9b591eaf81c05caa9b758ed1089203d533f630264cc5e433adef
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, as malicious and phishing-related. It contains numerous external URIs, many of which point to disposable domains and are likely part of a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is intended to lead users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/strik?utm_term=why+is+the+notebook+pg+13 PDF link annotation
    • http://rigoditibalun.mywebcommunity.org/69389342154.pdfIn PDF document text
    • http://kernig.pro/planes_controlados_telceljc492.pdfIn PDF document text
    • https://cdn.sqhk.co/barugogip/5rggOhb/basketball_games_for_android_phones.pdfIn PDF document text
    • http://ewop.space/116249952245ywj6.pdfIn PDF document text
    • https://cdn.sqhk.co/fusureviweki/ihijpig/page_plus_cellular_uses_verizon_network.pdfIn PDF document text
    • http://idealica-official.website/26486241388e7mln.pdfIn PDF document text
    • http://ipai.online/vevexetefipivonetfd9p.pdfIn PDF document text
    • http://mexicotop.xyz/where_can_i_drop_off_donations_today_near_me4lyn7.pdfIn PDF document text
    • http://natgood.space/kendo_spreadsheet_column_width_autoxcapi.pdfIn PDF document text
    • http://vuvulusigi.scienceontheweb.net/15032854188.pdfIn PDF document text
    • http://zoo-taxi.site/36742233045aomi4.pdfIn PDF document text
    • http://tvoyoproc.fun/greenlam_laminates_catalogue_2020_downloadzgm1x.pdfIn PDF document text
    • http://kersita.space/77328392363d3ztf.pdfIn PDF document text
    • http://beach-fruit.fun/neet_2019_answer_key_aakash_s6u5n9c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/81874258907.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/tazidowududowifelazero.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/14217716469.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE771 5276 bytes
SHA-256: a088c9dd8848292a49b01ba794751cfa052b3f3cc46ceded68ccdce1c650d7b4
font_01_sfnt_off0000f98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98E 11132 bytes
SHA-256: 40550fb56e3daec64327399bc5d532e45a162b414665f724b52768942eb8f1b3

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