Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d21ce9adab4fb74…

MALICIOUS

PDF

68.8 KB Created: 2021-03-03 09:47:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 936731f64e3b0770e8ac91600f41b101 SHA-1: 686fa03f74e6c88467033300c75fa094edd13bb8 SHA-256: 4d21ce9adab4fb744166d3a66c1c5fe0b3d00b3a7879db04da4b7ee804ff76cf
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV also flagged this file as malicious, suggesting it's part of a phishing or malware distribution campaign. The document body, though heavily obfuscated, appears to be a lure related to 'America's history 8th edition'. No scripts were extracted, but the presence of malicious redirectors strongly suggests the intent is to lead the user to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=america%2527s+history+8th+edition In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366063/normal_5fe98ce566d98.pdfIn PDF document text
    • http://nefritthebestthing.site/18297422054pn7yk.pdfIn PDF document text
    • http://kixiwogazu.sportsontheweb.net/honda_zoomer_x_parts_manual.pdfIn PDF document text
    • http://zitugaxusi.mygamesonline.org/focusrite_scarlett_2i4_2nd_gen_usb_audio_interface_with_pro_tools.pdfIn PDF document text
    • http://ritixibetono.mygamesonline.org/vudazopi.pdfIn PDF document text
    • http://esmoney.site/magic_magic_video_editor_pro_apk_modfnlwr.pdfIn PDF document text
    • http://bawazofo.getenjoyment.net/vaxalilepulapurakam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459787/normal_5ff08e5925f35.pdfIn PDF document text
    • http://rigoditibalun.mywebcommunity.org/principles_of_technical_drawing_giesecke.pdfIn PDF document text
    • http://securespot.ru/166641072604ubek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424991/normal_5fd63c36bb15b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vexabimumemig.atwebpages.com/thinkorswim_fees_penny_stocks.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/free_spark_browser_setup.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/la_lala_la_song_neha_kakkar.pdfIn PDF document text
    • http://bugenerefajujus.atwebpages.com/72828363122.pdfIn PDF document text
    • http://rulamiji.onlinewebshop.net/bandicam_free_product_key.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/sidefapuloxawomogalodi.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/lajilagu.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_off0000d205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD205 5468 bytes
SHA-256: 05bf9f834656d3b035817d6de1f1d6e1a410e8c9c42c82fc5544053e7d19ac80
font_01_sfnt_off0000e47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47D 9744 bytes
SHA-256: 5505224d9c2a4e61cb228c0aa61c844305bfa9bac2c2a1499666ed0ed14272d4

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