Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5113c40f67112a2…

MALICIOUS

PDF

78.7 KB Created: 2021-03-30 12:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: fb01e7c9ded5e81ce74bf011b2e002a3 SHA-1: 57d18174c6925eab29476194181075b5b43a2491 SHA-256: d5113c40f67112a26f5a22a26c41e06cb999a48c9ace679d8386fe7336b55f1f
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 0.9964

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://leonvi.ru/wix?keyword=worksheet+1+30+60+90+triangle+hypotenuse PDF link annotation
    • http://fodefon.getenjoyment.net/dr_seuss_beginner_books_amazon.pdfIn PDF document text
    • https://rigafimer.weebly.com/uploads/1/3/4/9/134901715/netoregurutozibosamo.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/49278526126.pdfIn PDF document text
    • http://zifufarox.getenjoyment.net/56882155789.pdfIn PDF document text
    • http://lowabunuzoxa.getenjoyment.net/pdf_bestand_kleiner_maken_adobe_reader.pdfIn PDF document text
    • https://feliwisinawo.weebly.com/uploads/1/3/1/8/131856919/2d80bbac5.pdfIn PDF document text
    • http://gonaxepafa.iblogger.org/tikajenesojit.pdfIn PDF document text
    • http://tokepubex.getenjoyment.net/download_driver_hp_photosmart_c5280_all_in_one.pdfIn PDF document text
    • https://sofovelo.weebly.com/uploads/1/3/1/3/131379060/b2dd14926157824.pdfIn PDF document text
    • http://lirinevewafa.mypressonline.com/ibm_selectric_repair_near_me.pdfIn PDF document text
    • https://jotozured.weebly.com/uploads/1/3/4/5/134588142/nonofojumi-kapojadamu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kusofiwu.epizy.com/menunozewixidetoreve.pdfIn PDF document text
    • http://kopolug.myartsonline.com/cambridge_igcse_computer_science_download.pdfIn PDF document text
    • http://momabuxamejuwev.rf.gd/free_flowchart_template_excel_2013.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/20885333758.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61fed124-957b-41e3-ba76-e2d303243aa2/jegevawiziti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81786cf8-5b99-48e9-8f4b-87dad6445a69/the_strongest_esv_exhaustive_concordance.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/snow_white_twisted_tale_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/622b1f64-fcad-4de4-906b-d0825ea85716/defiant_motion_sensor_light_home_depot.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/planned_economy_definition_us_history_quizlet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d717e4ca-beb3-4385-ba36-269b72849ee8/25866216965.pdfIn PDF document text
    • http://wilaroxu.atwebpages.com/zibonojujalamogigu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77553092-ed63-4512-b00f-31e8ff95e352/83034479924.pdfIn PDF document text
    • http://nibemodida.myartsonline.com/java_8_stream_foreach_add_to_list.pdfIn PDF document text
    • https://s3.amazonaws.com/sezewu/engineering_mechanics_statics_and_dynamics_5th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/bram_stoker_dracula_movie_quotes.pdfIn PDF document text
    • http://pumakiwidali.rf.gd/arban_trumpet_exercises.pdfIn PDF document text
    • http://datufubizut.rf.gd/arcadia_quest_beyond_the_grave_rules.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_off0000efc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC0 5928 bytes
SHA-256: 7599f6584f9745c49abfa6765cd236fee03c42c6967b4ed6b75c4402db6b9ed1
font_01_sfnt_off000103fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FC 11604 bytes
SHA-256: 035ba2bb882e2983c363ae6c34e6a537d1d38c2d2b190857ec13bbf24805cf67