Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa3da427bdbc3ac2…

MALICIOUS

PDF

114.7 KB Created: 2021-04-05 08:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 33b820aeded16a373be81bdaa24a8f2b SHA-1: 7107c9e6e53d261e2d0b9cc27b459a8831f89291 SHA-256: aa3da427bdbc3ac2f6a8ea2050460c48fb30e63a24077cf96962727a6fc734ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9995

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://xajibur.ru/wix?keyword=native+instruments+massive+manual PDF link annotation
    • https://cdn.sqhk.co/juviwonu/AhihfnA/relative_clauses_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/pitekofotada/aib21KT/wavupufowodufozusefiju.pdfIn PDF document text
    • http://shtangennstutkupitseychas.xyz/44050414786moml1.pdfIn PDF document text
    • http://haustova.com/urdu_adab_books_free_download2jvy3.pdfIn PDF document text
    • http://podarokinsta365.site/britax_infant_car_seat_height_and_weight_limits5t6qx.pdfIn PDF document text
    • http://senogibe.iblogger.org/carcassonne_mini_expansion_rules.pdfIn PDF document text
    • https://cdn.sqhk.co/xonivozew/TuSL0j9/popular_music_downloads_2019.pdfIn PDF document text
    • http://xagugudel.sportsontheweb.net/spoken_english_conversation_with_tamil_meaning_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xarupozikala/a1vIjjq/relufomatib.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarasam/uCib3NR/mass_for_the_dead_best_characters.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d3df31c7-72fe-42b1-a92e-0723e8ed7a16.filesusr.com/ugd/5bf82b_4b9adce7c6e249aeab949f23c29c40b2.pdf?index=trueIn PDF document text
    • http://funakadoni.rf.gd/whirlpool_duet_steam_dryer_manual_wed9600tw1.pdfIn PDF document text
    • http://dimumin.rf.gd/93744216252.pdfIn PDF document text
    • http://tafisazovelowu.rf.gd/carl_sagan_contact_book.pdfIn PDF document text
    • http://vivemowirarok.rf.gd/monobukuvimuga.pdfIn PDF document text
    • http://tenedumowukeruf.epizy.com/96159267404.pdfIn PDF document text
    • http://logiweliziweje.onlinewebshop.net/public_relations_officer_duties.pdfIn PDF document text
    • http://wekidezeze.epizy.com/vifabovok.pdfIn PDF document text
    • http://kovawasokagi.epizy.com/how_to_start_a_textual_analysis_essay.pdfIn PDF document text
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_dc988286af634157ae14bc459ae1a4d7.pdf?index=trueIn PDF document text
    • https://abf133a7-37c0-4616-b653-d99fd306bce3.filesusr.com/ugd/5c8236_fc042a9822e243c6be755a0f9729996f.pdf?index=trueIn PDF document text
    • https://1e35b969-1f99-48dc-8aa8-d0fb9638bdc8.filesusr.com/ugd/970baa_ffdf4abfce1b431fb12754ae9043dc4a.pdf?index=trueIn 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_off0001775d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1775D 4860 bytes
SHA-256: abf5053c7bbdf7ee8c195fec1e7abc92c78ffeaad07870dd9fd08d75b46cbef3
font_01_sfnt_off000187d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187D8 16432 bytes
SHA-256: 16c18441f6eca39164e8dc081c1a6bb2f31ceee5dd47dcf8320e4e054284ad11

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