Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f701e39868bbe6…

MALICIOUS

PDF

76.6 KB Created: 2021-03-08 03:51:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 784fe21848e9511bb649d3a58766cdb7 SHA-1: 2d421545f96ce7a6b2b2e08c8f08a004aaa45887 SHA-256: a4f701e39868bbe64b22ed412105cd41b6a97bbdd82e3de5485100b36a9125e1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=chemistry+semester+1+exam+review+answers PDF link annotation
    • http://sozimaxetupow.mywebcommunity.org/star_wars_novels_chronological_list.pdfIn PDF document text
    • https://cdn.sqhk.co/joxutedunik/bjdhfge/skylanders_giants_wii_portal.pdfIn PDF document text
    • https://ramimuluvisefo.weebly.com/uploads/1/3/0/7/130775145/tiwivumadikeme_remeno.pdfIn PDF document text
    • https://cdn.sqhk.co/numexerab/k2Tmgfc/2_player_shooting_games_unblocked_at_school.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/iUG5njg/94898373376.pdfIn PDF document text
    • https://daniveledize.weebly.com/uploads/1/3/4/9/134900130/3af8d8f.pdfIn PDF document text
    • https://tubolapibakosi.weebly.com/uploads/1/3/4/8/134872187/9517094.pdfIn PDF document text
    • https://cdn.sqhk.co/matijamaj/jaifidM/66305731954.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475197/normal_600c3f4a37775.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481155/normal_600f209b634fc.pdfIn PDF document text
    • http://govazibibili.22web.org/52517740425.pdfIn PDF document text
    • http://tifoxikutawe.sportsontheweb.net/10408954438.pdfIn PDF document text
    • https://cdn.sqhk.co/sixitigoxeto/5GhcKbY/piano_music_maker_free.pdfIn PDF document text
    • https://lawilutimi.weebly.com/uploads/1/3/4/8/134879912/21dcedad0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://lojogonofar.rf.gd/72363769993.pdfIn PDF document text
    • http://mexesumofiruvaf.rf.gd/electric_circuit_calculations_worksheet.pdfIn PDF document text
    • http://zejibanunepi.myartsonline.com/638464179.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/7123903911.pdfIn PDF document text
    • http://dapekafuxururo.myartsonline.com/data_communication_and_networking_ppt_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/buffalo_slot_machine_game.pdfIn PDF document text
    • http://jaxuziwemulogel.rf.gd/android_one_ui_for_s7_edge.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/chrisette_michele_epiphany_album_zip.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/39127153900.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B5 4968 bytes
SHA-256: 849d3a2318ad4bd2938c607f67faeefc40828fd40287b7d6f75e151130cdb5d9
font_01_sfnt_off0000f286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF286 10532 bytes
SHA-256: 10bfdd4f2790f3e3e52369e5ffa430febf4c5d7c9e1b069efd5b2e7c9982b2c0
font_02_sfnt_off00011697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11697 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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