Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c818ac3cda3ddf1…

MALICIOUS

PDF

75.9 KB Created: 2021-03-18 03:21:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c3220ffe641a4535c934b2c98c587e47 SHA-1: b5e249b2f3172ef2cf68211c4eb1905a985d4d7d SHA-256: 6c818ac3cda3ddf12cec2fc72eb56de910cefab36ba2cfb6002199d2c9b0ceed
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to various PDF documents, suggesting a link farm or content stuffing tactic. One prominent URL, https://xajibur.ru/award?keyword=major+causes+and+consequences+of+deforestation+pdf, is presented as the document's content, indicating a potential phishing or scam lure. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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/award?keyword=major+causes+and+consequences+of+deforestation+pdf PDF link annotation
    • http://vewigufirenaw.22web.org/pavlov_classical_conditioning_theory.pdfIn PDF document text
    • http://wuramegojuluz.mywebcommunity.org/adobe_premiere_pro_basic_video_editing.pdfIn PDF document text
    • http://xewixejixukumes.22web.org/flannel_bed_sheets_full_size.pdfIn PDF document text
    • https://zugowexilib.weebly.com/uploads/1/3/5/3/135349829/8172052.pdfIn PDF document text
    • https://gipafefigemer.weebly.com/uploads/1/3/4/0/134097902/tewowukesaj_zilusamo.pdfIn PDF document text
    • http://janafan.scienceontheweb.net/5745011971.pdfIn PDF document text
    • https://zizovelet.weebly.com/uploads/1/3/1/3/131380569/finud-fimakebiginutux-waletoraba.pdfIn PDF document text
    • https://xezajorawelo.weebly.com/uploads/1/3/1/4/131408008/7484115.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/amazon_flex_app_android_apk.pdfIn PDF document text
    • http://xufeguwopox.rf.gd/24754206848.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/college_board_sat_physics_practice_test.pdfIn PDF document text
    • http://fewulagoxifi.epizy.com/93253482051.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/act_bubble_answer_sheet.pdfIn PDF document text
    • http://jadupapobixe.epizy.com/adobe_photoshop_latest_version_free_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/muwive.pdfIn PDF document text
    • http://sodebaxekigefip.rf.gd/b._ed_form_2019_online.pdfIn PDF document text
    • http://surifetopene.epizy.com/best_reader_app_for_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/china_consulate_perth_visa_application_form.pdfIn PDF document text
    • http://ritanuwo.epizy.com/guidepoint_pharmacy_winthrop_minnesota.pdfIn PDF document text
    • http://dibawuleseba.rf.gd/72803760431.pdfIn PDF document text
    • http://petifogowiga.epizy.com/bash_shell_for_windows_10.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_off0000ecbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBC 5324 bytes
SHA-256: 09f47f93758e751eb98bcf7b7a261b3afc39e0c314e341bbe00700a0da5e068c
font_01_sfnt_off0000fef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF6 10240 bytes
SHA-256: bcdd287511becde74cda07bb4b353616b71dc8788382aeee0791e9a5c37402a4

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