Malicious PDF — malware analysis report

Static analysis result for SHA-256 727641dbd1ecc14d…

MALICIOUS

PDF

75.9 KB Created: 2021-04-05 12:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 71241c4966565feeb8d5133a444fb1b0 SHA-1: 8200cb93b7a7181c8962900f88a7fcb2f3de093b SHA-256: 727641dbd1ecc14d0ed15581569ecf4b239d6ea16fc5ca6a58f75b5288156a30
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 0.9998

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://gimoguvi.ru/strik?utm_term=best+minecraft+island+seeds+1.14 PDF link annotation
    • https://fexedewikefitug.weebly.com/uploads/1/3/2/6/132681233/xisebinapulune.pdfIn PDF document text
    • https://labekefetimobu.weebly.com/uploads/1/3/0/7/130739294/lapezujipetud_foxizo_jojipofavu.pdfIn PDF document text
    • https://luzepomi.weebly.com/uploads/1/3/1/8/131856518/pifuvuvotesopinavovi.pdfIn PDF document text
    • http://prizinsta24.online/friction_and_gravity_lesson_quiz_worksheet_answer_keyw63rf.pdfIn PDF document text
    • http://return-0.com/50079380057hkdfr.pdfIn PDF document text
    • http://optalpha.com/intercessory_prayer_for_church_growthqsnlj.pdfIn PDF document text
    • http://webpost.pro/dream_home_board_game_varietystreaming7t3cc.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.website/jedubetebdrn5.pdfIn PDF document text
    • http://quickpapp.online/cheats_world_war_z_pc7ovzw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://midejoxujonaler.rf.gd/wordpress_get_installed_plugins.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/safety_first_grow_and_go_3_in_1_car_seat_installation_video.pdfIn PDF document text
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_9e6c198cb56545afb87b4a69a5714e7a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lezerawe/12273107387.pdfIn PDF document text
    • https://cceb078e-1df6-42b0-9e12-359f30e42f1d.filesusr.com/ugd/e8506d_9528340171904c4da5a8c7e6b7502afd.pdf?index=trueIn PDF document text
    • https://50b44c92-959e-4a15-bf83-93d6b2b518d6.filesusr.com/ugd/3ed44c_4360c2affc6b4fd39c3af7f77fb656e0.pdf?index=trueIn PDF document text
    • http://gelofobomafagez.epizy.com/taribozinunudorel.pdfIn PDF document text
    • http://marenoko.epizy.com/13_reasons_why_jay_asher_genre.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/what_is_the_best_free_wysiwyg_html_editor.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/headway_intermediate_fourth_edition_workbook_answers.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_off0000ec94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC94 5388 bytes
SHA-256: b1f0a97865d568f06cf581f7e129e9203be1a4170b27188ccf28de6365d71708
font_01_sfnt_off0000feda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDA 10572 bytes
SHA-256: 8cb5883f3105aee5e30ce597a567fbd66dc344a151565a927046ba26d6239b60

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