Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f5cff927e3e595…

MALICIOUS

PDF

77.8 KB Created: 2021-03-14 09:22:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3226a714a8ea245abc0292ef43c4144f SHA-1: 825b60c9c695d0daf4f9ba4585296de2abaf901b SHA-256: e6f5cff927e3e595561390548d5ecb2ea6af500cb12059718083fbe2e44e9722
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/award?keyword=hormonas+antienvejecimiento+pdf PDF link annotation
    • https://cdn.sqhk.co/nugopanage/MhhqEhd/51079441438.pdfIn PDF document text
    • https://cdn.sqhk.co/vujejanar/eUHhaia/royale_battle_survivor_mod_apk.pdfIn PDF document text
    • http://idealslimitalia-official.site/2408571129u1kc9.pdfIn PDF document text
    • https://jatuserunel.weebly.com/uploads/1/3/4/6/134682763/6253171.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/jc84qhd/business_plan_definition_and_examples.pdfIn PDF document text
    • http://igcopyrightforhelps.com/831893763193sj8w.pdfIn PDF document text
    • https://susafoxepi.weebly.com/uploads/1/3/0/7/130775374/7783764.pdfIn PDF document text
    • http://peludofnor.fun/cant_help_falling_in_love_chordsmhmke.pdfIn PDF document text
    • https://julasunanuk.weebly.com/uploads/1/3/4/3/134308365/4967425.pdfIn PDF document text
    • http://tokio-2020.fun/67842763678br29x.pdfIn PDF document text
    • http://zahlungsservice-ch.site/58126030285fk055.pdfIn PDF document text
    • https://cdn.sqhk.co/jumifokujuje/h6hhUIS/65621140645.pdfIn PDF document text
    • https://cdn.sqhk.co/wevexifimur/fCOghVW/dj_name_mixer_pro_apk_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d73c234d-0e3d-497d-8108-d5659bace061.filesusr.com/ugd/58a813_e80d6c809acf4904b72fdeb59c6a8577.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/beb7bf05-5b5d-4ed4-badb-615411e22486/identidades_trigonometricas_hiperbolicas_formulario.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c62613af-a159-45b2-ba38-7a350b090ad1/ap_human_geography_chapter_1_vocabulary_quizlet.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/73878732451.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70f38367-6c7f-4619-8149-9be03e8df88d/vuxurobozepuvofe.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/key_terms_chemical_reactions_worksheet_answers.pdfIn PDF document text
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_ea0783f4f89c436f95deb22a06e31424.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dadupawo/ios_action_sheet_ipad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99cdf5b7-6cef-49c5-b027-68d71f2e547a/rexuga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e08e06a0-f169-447c-a2ab-1ef58d578560/the_real_book_of_real_estate_review.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_off0000f09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09B 5368 bytes
SHA-256: 817473a235b72fe4899978198239681c74e8d38344ea1a22088d97117eda6ec0
font_01_sfnt_off000102ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CE 11548 bytes
SHA-256: 5e1cafc3ec12663d592f9a3d8db3c88d1da98e97d1247f15545849ea6608ea8e