Malicious PDF — malware analysis report

Static analysis result for SHA-256 3516926041806ffe…

MALICIOUS

PDF

80.4 KB Created: 2021-04-01 01:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a235bf43b7a8ac27f32d1d3b4ecf5c59 SHA-1: 4ae06be3ab58c70f7a194c9ccb7553ae5c44bbf9 SHA-256: 3516926041806ffec5ca388311922455445a889343abd94dec64a675b1ff0b32
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, including one that appears to be a phishing lure related to employee contracts. The PDF structure and embedded content suggest it's designed to drive traffic to these sites, potentially for SEO spam or to host further malicious content.

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://seumenha.ru/award?keyword=employee+contract+sample+pdf PDF link annotation
    • http://kazaxukiga.getenjoyment.net/reading_book_online.pdfIn PDF document text
    • http://pexulisinipev.sportsontheweb.net/how_to_repair_deltran_battery_tender.pdfIn PDF document text
    • http://leziwazedo.mypressonline.com/1979_chevy_truck_owners_manual.pdfIn PDF document text
    • http://mozaduz.mygamesonline.org/online_bookstore_project_report_in_php.pdfIn PDF document text
    • http://zisezamerares.mygamesonline.org/66201945505.pdfIn PDF document text
    • http://xilavinem.medianewsonline.com/nursing_assessment_process.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/2edccb6f-572e-494e-9ae2-ee3a5702e9ee/vufudikuxiv.pdfIn PDF document text
    • https://2e4d99de-9d37-4ce2-abd5-0bbccafdbe51.filesusr.com/ugd/33a2e4_445a82ceeac440099cf3caf80ec614af.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1542747-7efe-48ac-b321-7d80e2931498/google_maps_timeline_creepy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b01bce95-9e5b-4ae5-82da-a1a9f96c842c/how_to_remove_a_ge_profile_microwave.pdfIn PDF document text
    • https://d67926d6-99fe-48a4-938f-95006fdf2de6.filesusr.com/ugd/21d82e_66c069f5cb204eeba9f6e9a978a2de72.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/dijakawegalowevilibex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91ad9bea-332e-4c15-afbf-a38a7f4fb7e8/tuxotojelikonex.pdfIn PDF document text
    • http://kuxoxokazutuv.myartsonline.com/68717360028.pdfIn PDF document text
    • http://rijemow.onlinewebshop.net/popstar_never_stop_never_stopping_trailer_deutsch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/006c0568-bb7b-4010-b06e-88b1e3c4c5c9/losikinipijewirezajoxevez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9fb0e32-ba48-4855-a74c-18b9c80bba20/exploring_chemical_analysis_daniel_c_harris_5th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de2aafa3-bb1d-4008-b6c3-cbc2fe657eec/how_to_become_a_clinical_nutrition_specialist.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/98693224390.pdfIn PDF document text
    • https://63995da9-74be-4895-8497-a4fa53c9845d.filesusr.com/ugd/788c84_546034d64a774fdcaa451ff908423546.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bepukuba/22764736946.pdfIn PDF document text
    • https://e5720c39-3c1c-4a52-9be9-509675281b5a.filesusr.com/ugd/0010c8_14f434ebc2c043b39c6e65ba66bc10da.pdf?index=trueIn PDF document text
    • http://nabulegewuwal.myartsonline.com/dell_optiplex_gx620_cpu_support_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b85ce3c-380f-4a37-ad67-4c138412aa10/68103615306.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/koridezobokokuvadore.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_off0000fe2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2F 5360 bytes
SHA-256: 2f86649c50c0c97da5e4ecbd214dcb4f6e0f46e6317015c8b5ba7f45b119a348
font_01_sfnt_off0001105d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105D 10564 bytes
SHA-256: 8dbdb9cc75fc40bb1fcd1db7bcbca8777d545585544d46af29f37513ab3a054e

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