Malicious PDF — malware analysis report

Static analysis result for SHA-256 78ca5b1710d64dd0…

MALICIOUS

PDF

69.8 KB Created: 2021-03-11 06:49:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5e50e9c3825e66c32885881cef7e67ef SHA-1: 1506705f202518574050d1dc5417ccb07b693f89 SHA-256: 78ca5b1710d64dd01672101ec51dbdf38d6a7e3c848334c1f30db51984a1a2a6
134 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=oxford+bookworms+pdf+stage+6 PDF link annotation
    • https://cdn.sqhk.co/vifekodilevi/lUhjVie/movie_at_http_tinyurl._com_hyzyoeq.pdfIn PDF document text
    • http://natgood.space/premier_protein_bars_costco_canada38uky.pdfIn PDF document text
    • https://cdn.sqhk.co/muvotugi/H9jdieF/harvard_business_review_italia_opinioni.pdfIn PDF document text
    • https://cdn.sqhk.co/nulusezitelo/PkiiBhN/86658311802.pdfIn PDF document text
    • https://cdn.sqhk.co/devisojop/KhePW3h/47393635277.pdfIn PDF document text
    • http://sosyaltakipcipanelin.com/best_android_search_app5xble.pdfIn PDF document text
    • https://cdn.sqhk.co/revinoxu/e0hfbOs/paypal_login_problem.pdfIn PDF document text
    • http://dreamingdeveloper.com/28389450904eg3x1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cedf0a9-8906-4468-978c-8fd1e09587b9/course_2_chapter_1_ratios_and_proportional_reasoning_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ca2729a-5abc-45cd-96b7-7d516f401035/sex_education_in_schools_history.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8843d3d2-eeee-4be1-a34b-d71096eaafdb/highway_capacity_software_2010.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfd69c51-4719-4380-bdd7-633ac7713774/calculo_integral_conamat_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2d3fc41-03f1-4e50-a8fb-8c698b4fc82d/45675208209.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c722d72-01fa-44e1-9c98-7e3b19dc6d3a/what_is_the_purpose_of_curriculum_innovation.pdfIn PDF document text
    • http://nibopinalilabaj.onlinewebshop.net/63398386028.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8474f8cb-386a-4af5-a30b-369f3c15fc4d/jitebalituzufudawiza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f03a621c-b7ba-490f-92d8-35dc21d80c9d/48019094794.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3210fc32-77a7-4d50-b841-9491124776bc/feviv.pdfIn PDF document text
    • http://xekazaz.myartsonline.com/marvel_super_heroes_adventure_gamebook.pdfIn PDF document text
    • http://rewuwuja.onlinewebshop.net/borrador_duas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3bbb9d3-ba0a-4e1b-b877-967c5a41b50d/rounding_significant_figures_worksheet_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccb3d1ba-3835-4fba-8ab7-cc9a0e2bf56f/sherlock_holmes_books_set.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_off0000d23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23C 5872 bytes
SHA-256: 2f7872322b23595bf9ceeb89ca543459faded8f9254cd8c58ba3f71dcdf86105
font_01_sfnt_off0000e637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE637 10428 bytes
SHA-256: 4735c77688cde1827871d121a8f09ac25d07abf7a7dcee5184501c06097af9a2