Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb0428731cfe925d…

MALICIOUS

PDF

74.3 KB Created: 2021-03-03 19:55:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9d87019d851bb5483acccc68fe2a3f2f SHA-1: bf2611c618543c7bdaecf8332402e99157fc1447 SHA-256: fb0428731cfe925d3f0e0c06777a00f49440ba7ea3a3f0935d08e814b3451b6a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to distribute malware or conduct phishing. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to obscure the true destination of the links. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics indicate a likely attempt to redirect the user to a malicious site.

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://lozipotod.ru/wix?keyword=toefl+official+guide+5th+edition PDF link annotation
    • http://gejedesoni.getenjoyment.net/51547719463.pdfIn PDF document text
    • http://lololoj.sportsontheweb.net/zifebizojaluwi.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxofidipo/Zhgzii7/siwowajoxa.pdfIn PDF document text
    • https://cdn.sqhk.co/xelalizogim/Ajeiegi/nivesofufokimasagiva.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486037/normal_600254d928b8f.pdfIn PDF document text
    • http://carluxepaint.site/givovivozusunobixi07c4k.pdfIn PDF document text
    • http://groby-ritual.online/jegelolumakedogidixosoi9p1h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482854/normal_6022a29a510cd.pdfIn PDF document text
    • http://puwuditufu.22web.org/fafezifimasi.pdfIn PDF document text
    • http://digitalmedialit.com/wheel_of_time_series_tv_imdbj4hxr.pdfIn PDF document text
    • http://wadumutid.iblogger.org/how_do_you_address_a_letter_to_southern_ireland.pdfIn PDF document text
    • http://vatosake.iblogger.org/xajiwedapulawumave.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370304/normal_602ed43b30f26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426543/normal_603a9774eb971.pdfIn PDF document text
    • http://edarudost.online/twinkle_twinkle_little_star_trumpet_sheet_musicgc8oz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wapudajikipidem.epizy.com/xikiganedivenim.pdfIn PDF document text
    • http://nezebur.epizy.com/43979782097.pdfIn PDF document text
    • http://rimejerolusin.epizy.com/what_is_the_most_unforgivable_sin_in_the_bible.pdfIn PDF document text
    • http://merovuditipin.onlinewebshop.net/geometry_basics_points_lines_and_planes_worksheet_answers.pdfIn PDF document text
    • http://butadiviwev.rf.gd/chemistry_periodic_table_review_answers.pdfIn PDF document text
    • http://degivenumi.epizy.com/vishnu_sahasranama_marathi.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_off0000e659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE659 5084 bytes
SHA-256: 761d2d6f1bb2f16b5ef815c70f0c6323877c4b00c77b696bef5a95855bec3456
font_01_sfnt_off0000f7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A9 10800 bytes
SHA-256: afdc17622e348810967addb08244e974d7bb65041f61b3cb9d6860c5e07535bb

Open this report in the interactive analyzer, or submit your own file for analysis.