Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fede83360a7d573…

MALICIOUS

PDF

82.8 KB Created: 2021-03-17 05:42:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cdabd28a45140e472cbb4126883a2dc8 SHA-1: 14c0f444ab68115b65feeda6898a150daf3b3786 SHA-256: 9fede83360a7d573630eecb418623ab457bfc2c0e0f3f0fc2e8e14cf72a942f9
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://resalured.ru/wix?keyword=process+of+devolution+ap+human+geography PDF link annotation
    • http://rusherx.studio/descargar_mixtrax_app_gratisdg7oq.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/taco_bell_steak_quesadilla_nutrition_facts89jrm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405440/normal_6042c10fc25cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460471/normal_604d91bcd11be.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/wopari/guelph_bariatric_surgery_diet_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b753af3-1e17-49ac-955a-33fc554a737c/metro_2033_moscow_dead_city_walkthrough.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/what_causes_a_honda_lawn_mower_to_backfire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e214fc2f-259a-4337-90bb-b09e59be9b75/harry_potter_books_illustrated_pop_up.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ef65970-011b-4d8c-b166-e94dfdd57cc5/gelifopewutosugowanafo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a33d006-0d39-4031-bbc0-84cc67ef2d67/generac_gp3250_reviews.pdfIn PDF document text
    • http://wilixafex.epizy.com/97375876911.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6d210ee-25af-4f23-b482-27ccd2cb38ae/weed_eater_lawn_mower_parts_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73565089-b20f-45fd-965e-db84c947c46b/easy_way_to_write_an_essay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/507e0c68-2b3f-49b2-843d-43e75b1435d1/what_to_do_when_internet_light_on_modem_is_red.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/96428369489.pdfIn PDF document text
    • http://dukivudote.epizy.com/34042300319.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/234ac53b-bcf2-4f2a-8a22-ef99dc21a679/panumazaloso.pdfIn PDF document text
    • http://menoziduwuju.epizy.com/simile_examples_sentences.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8d62a9b-c4ca-48e7-92f8-c802939b43e9/39203000576.pdfIn PDF document text
    • https://s3.amazonaws.com/rowubunak/78302345392.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4eb9933b-78b7-46af-be5b-3bf1010896bb/burger_king_nutrition_uk.pdfIn PDF document text
    • http://sudebavegubud.epizy.com/tiratorojamafojema.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_off0000f334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF334 5732 bytes
SHA-256: 247c7c4ede1a4e8eeb3b7e78f91bf06279c3d3556d438d4f33d3e9cc2a498d3f
font_01_sfnt_off0001069a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069A 18196 bytes
SHA-256: 5485069e874ab2c092187576471849641850e15a5ee0b955c2281674b48b5c68

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