Malicious PDF — malware analysis report

Static analysis result for SHA-256 adac97b2a7976bff…

MALICIOUS

PDF

75.3 KB Created: 2021-02-26 22:57:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 35741a1efc36cda1019c8190f0313721 SHA-1: 2d84c12fef5a5115cf9244e79b70c8c525154b33 SHA-256: adac97b2a7976bffbe399a758f6994b63c43f7a88553469edcc9e229986d4045
126 Risk Score

Malware Insights

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

The file is a PDF with numerous embedded URLs, many pointing to disposable or suspicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest the document is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://midufefew.ru/award?keyword=epson+xp+620+ink PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486758/normal_60379d50c428f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456671/normal_6030fa6fb1096.pdfIn PDF document text
    • http://doporujela.iblogger.org/68977357929.pdfIn PDF document text
    • http://vanimerukaguto.scienceontheweb.net/20156336311.pdfIn PDF document text
    • https://cdn.sqhk.co/bidusowo/Rhhhfhf/shooter_cast_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/rubogomuweme/jcjgZhi/fear_the_walking_dead_season_5_episode_2.pdfIn PDF document text
    • https://cdn.sqhk.co/neratimo/ehdigwL/xuzexax.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/38909100699.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zupitatip.atwebpages.com/brother_hl-5470dw_fuser_replacement.pdfIn PDF document text
    • http://tososite.onlinewebshop.net/past_simple_affirmative_exercises_perfect_english_grammar.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/bt_home_hub_password_format.pdfIn PDF document text
    • http://gitexilamivori.epizy.com/somalimiwudu.pdfIn PDF document text
    • http://biwipekimati.rf.gd/bcbs_prior_authorization_form_for_medication_illinois.pdfIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/automated_drain_gutter_cleaner_project_report.pdfIn PDF document text
    • http://geforagegi.atwebpages.com/75469134208.pdfIn PDF document text
    • http://revudipepofaten.myartsonline.com/craftsman_air_compressor_20_gallon_1.5hp.pdfIn PDF document text
    • http://sibubixusa.epizy.com/ugly_duckling_series.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_off0000dce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE6 4992 bytes
SHA-256: 629779044a84e6dceb1964c12217f93a8fac88106a78c37ec907cce05b7a4eb2
font_01_sfnt_off0000ee0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0A 15720 bytes
SHA-256: bc60238f6bcf50fdbe32036ebf25c5f23d08f924bc6dc96cad9c9a2f9620888f

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