Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b0a25a803e9f4ee…

MALICIOUS

PDF

82.2 KB Created: 2021-03-01 20:26:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 31812c66c1b83139c2cd432358791c06 SHA-1: 619995c592a40bcb3939f7fb9df6c55024ba38fb SHA-256: 7b0a25a803e9f4eee180c14808c7baedef093b564cdc132758bcfd4bb5a53658
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a primary focus on `https://midufefew.ru/award?keyword=federal+rules+of+civil+procedure+26+proportionality`. This heuristic, combined with the ML classifier flagging the PDF as malicious, strongly suggests a link farm or SEO poisoning attack. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the presence of many external links points towards a malicious redirection or download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://midufefew.ru/award?keyword=federal+rules+of+civil+procedure+26+proportionality PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4497348/normal_601c6ef485077.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465555/normal_603c37f5149d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489713/normal_5ff2740574835.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465255/normal_5fe78b68bd96f.pdfIn PDF document text
    • https://figuzenage.weebly.com/uploads/1/3/4/4/134472600/8179336.pdfIn PDF document text
    • https://murenelu.weebly.com/uploads/1/3/1/8/131856612/8993719.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405413/normal_5fd14ae157b33.pdfIn PDF document text
    • https://wutaleba.weebly.com/uploads/1/3/5/3/135390467/bonivifosewetasenaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379726/normal_600651f262433.pdfIn PDF document text
    • https://tizelizenofus.weebly.com/uploads/1/3/0/7/130740364/biwivagawuz_sowepijadikoto_fefugob_duriwu.pdfIn PDF document text
    • http://ooovseanalizi.ru/badapumoqaryq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372355/normal_5fea0a54c768a.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/ganubatebedoxez/hey_mama_ma_song.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/entry_form_template_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/80817270271.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/gefokesigexubuveli.pdfIn PDF document text
    • https://s3.amazonaws.com/kimone/current_weather_report_in_pune.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/79921644321.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/help_informatica_pocos_de_caldas_telefone.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_off0001028f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028F 5552 bytes
SHA-256: fc94ee185d8a903195a6e82f227d7b3b19760f186fa8085e529d96edcd14d07b
font_01_sfnt_off00011597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11597 11112 bytes
SHA-256: 8d157fa2f94477a33fc5345869d0f783bec7ee90ce3cd8ea95d146291243106d

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