Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdff424464dcf271…

MALICIOUS

PDF

78.3 KB Created: 2021-05-14 08:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0a8ed0200ee5d451d4ddeca3b0d6fa5a SHA-1: 4ad8e574ae6ae5c5d5bb9091ce9de54e19029d18 SHA-256: bdff424464dcf271e8b91180272cec66b97eb968575cedebd8717e48aed19c51
164 Risk Score

Malware Insights

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

The PDF file contains a lure related to 'Us army reserve retirement pay scale' and embeds a large number of external links, many of which are suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a link farm designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/strik?utm_term=us+army+reserve+retirement+pay+scale PDF link annotation
    • https://juponujebiz.weebly.com/uploads/1/3/4/7/134773331/jijigelolur.pdfIn PDF document text
    • http://dabukim.mygamesonline.org/greenhouse_effect_seminar.pdfIn PDF document text
    • http://xbet1.fun/77225686225w01x.pdfIn PDF document text
    • https://pinoxelu.weebly.com/uploads/1/3/4/1/134108818/5465651.pdfIn PDF document text
    • https://kopusinuzek.weebly.com/uploads/1/3/4/1/134131929/safomokadesepezuwo.pdfIn PDF document text
    • http://vimabanu.sportsontheweb.net/ctet_answer_key_2020_paper_2_set_m.pdfIn PDF document text
    • http://womans30planet.com/nadirigiwirugidadi0oujk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puzuritutu.rf.gd/zoology_practical_book_for_bsc_1st_year.pdfIn PDF document text
    • https://f79c4d19-9b07-4ca9-ba82-4f938217db57.filesusr.com/ugd/c0d3e8_74dba21da7ed4c2889bcc93b7eed32b4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vebenok/bebiguvo.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/61967574817.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/bhagat_singh_birthday_2019.pdfIn PDF document text
    • https://01d67eed-50ba-4ccb-8f82-c1581f7ed07e.filesusr.com/ugd/e3325f_6a509165f198448eb205f0a80a02f988.pdf?index=trueIn PDF document text
    • http://xemigososefof.atwebpages.com/behavior_management_chart.pdfIn PDF document text
    • http://fowakoleviwamop.onlinewebshop.net/jonosidexa.pdfIn PDF document text
    • http://jomedive.epizy.com/les_miserables_pbs_full_cast.pdfIn PDF document text
    • https://s3.amazonaws.com/nojemi/yamaha_yz250_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/rosina_lippi_green_english_with_an_accent.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_off0000f5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C4 5232 bytes
SHA-256: 545cb3f012a3aba9b3be92f5b0bc817c1bfb30bb5e35068c48f25ec88c7a842f
font_01_sfnt_off0001078b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078B 10644 bytes
SHA-256: 97e8fe464c3e62d3f49982d2757faad81e929408122aaec0dcc8cc1ef43ef63e

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